feat(tree): add flat and lazy modes for tree data handling

* Implement flat mode to transform flat data with parentId to nested structure.
* Introduce lazy mode for on-demand loading of children.
* Update tree rendering logic to accommodate new modes.
* Enhance tree cell expansion logic to support lazy loading.
* Add dark mode styles for improved UI experience.
* Create comprehensive end-to-end tests for tree functionality.

.gitignore

@@ -25,3 +25,5 @@ dist-ssr
 
 *storybook.log
 storybook-static
+test-results/
+playwright-report/

.storybook/main.ts

@@ -1,13 +1,13 @@
 import type { StorybookConfig } from '@storybook/react-vite';
 
 const config: StorybookConfig = {
-  "stories": [
-    "../src/**/*.stories.@(js|jsx|mjs|ts|tsx)"
-  ],
-  "addons": [],
-  "framework": {
-    "name": "@storybook/react-vite",
-    "options": {}
-  }
+  addons: [],
+  framework: {
+    name: '@storybook/react-vite',
+    options: {
+      strictMode: true,
+    },
+  },
+  stories: ['../src/**/*.stories.@(js|jsx|mjs|ts|tsx)'],
 };
 export default config;

.storybook/preview.ts

@@ -4,6 +4,23 @@ import { PreviewDecorator } from './previewDecorator';
 
 const preview: Preview = {
   decorators: [PreviewDecorator],
+  globalTypes: {
+    colorScheme: {
+      description: 'Mantine color scheme',
+      toolbar: {
+        dynamicTitle: true,
+        icon: 'paintbrush',
+        items: [
+          { icon: 'sun', title: 'Light', value: 'light' },
+          { icon: 'moon', title: 'Dark', value: 'dark' },
+        ],
+        title: 'Color Scheme',
+      },
+    },
+  },
+  initialGlobals: {
+    colorScheme: 'light',
+  },
   parameters: {
     actions: { argTypesRegex: '^on[A-Z].*' },
     controls: {
@@ -13,6 +30,7 @@ const preview: Preview = {
       },
     },
     layout: 'fullscreen',
+    viewMode: 'desktop',
   },
 };
 

.storybook/previewDecorator.tsx

@@ -8,7 +8,8 @@ import { ModalsProvider } from '@mantine/modals';
 import { GlobalStateStoreProvider } from '../src/GlobalStateStore';
 
 export const PreviewDecorator: Decorator = (Story, context) => {
-  const { parameters } = context;
+  const { parameters, globals } = context;
+  const colorScheme = globals.colorScheme as 'light' | 'dark';
 
   // Allow stories to opt-out of GlobalStateStore provider
   const useGlobalStore = parameters.globalStore !== false;
@@ -21,7 +22,8 @@ export const PreviewDecorator: Decorator = (Story, context) => {
   };
 
   return (
-    <MantineProvider>
+    <MantineProvider forceColorScheme={colorScheme}>
+      
       <ModalsProvider>
         {useGlobalStore ? (
           <GlobalStateStoreProvider fetchOnMount={false}>

CHANGELOG.md

@@ -1,5 +1,48 @@
 # @warkypublic/zustandsyncstore
 
+## 0.0.49
+
+### Patch Changes
+
+- 74549f2: fix(Gridler): refresh cells after data load
+
+## 0.0.48
+
+### Patch Changes
+
+- fd9af3d: fix(Gridler): improve height and width fallback logic
+
+## 0.0.47
+
+### Patch Changes
+
+- a15b67f: fix(Gridler): update ready state management logic
+
+## 0.0.46
+
+### Patch Changes
+
+- 0b2ab98: row selection with incorrect values
+
+## 0.0.45
+
+### Patch Changes
+
+- cb340b2: chore: ⬆ Update deps
+  fix: empty key, should no do rownumber call
+
+## 0.0.44
+
+### Patch Changes
+
+- 40ae30e: Select first row bug fixes
+
+## 0.0.43
+
+### Patch Changes
+
+- 3f9c4c5: Gridler selection fixes
+
 ## 0.0.42
 
 ### Patch Changes

llm/docs/resolvespec-js.md

@@ -0,0 +1,263 @@
+# @warkypublic/resolvespec-js v1.0.0
+
+TypeScript client library for ResolveSpec APIs. Supports body-based REST, header-based REST, and WebSocket protocols. Aligns with Go backend types.
+
+## Clients
+
+| Client | Protocol | Singleton Factory |
+|---|---|---|
+| `ResolveSpecClient` | REST (body JSON) | `getResolveSpecClient(config)` |
+| `HeaderSpecClient` | REST (HTTP headers) | `getHeaderSpecClient(config)` |
+| `WebSocketClient` | WebSocket | `getWebSocketClient(config)` |
+
+Singleton factories cache instances keyed by URL.
+
+## Config
+
+```typescript
+interface ClientConfig {
+  baseUrl: string;
+  token?: string;  // Bearer token
+}
+
+interface WebSocketClientConfig {
+  url: string;
+  reconnect?: boolean;
+  reconnectInterval?: number;
+  maxReconnectAttempts?: number;
+  heartbeatInterval?: number;
+  debug?: boolean;
+}
+```
+
+## ResolveSpecClient (Body-Based REST)
+
+```typescript
+import { ResolveSpecClient, getResolveSpecClient } from '@warkypublic/resolvespec-js';
+
+const client = new ResolveSpecClient({ baseUrl: 'http://localhost:3000', token: 'your-token' });
+
+// CRUD - signature: (schema, entity, id?, options?)
+await client.read('public', 'users', undefined, { columns: ['id', 'name'], limit: 10 });
+await client.read('public', 'users', 42);                          // by ID
+await client.create('public', 'users', { name: 'New' });           // create
+await client.update('public', 'users', { name: 'Updated' }, 42);   // update
+await client.delete('public', 'users', 42);                        // delete
+await client.getMetadata('public', 'users');                        // table metadata
+```
+
+**Method signatures:**
+- `read<T>(schema, entity, id?: number|string|string[], options?): Promise<APIResponse<T>>`
+- `create<T>(schema, entity, data: any|any[], options?): Promise<APIResponse<T>>`
+- `update<T>(schema, entity, data: any|any[], id?: number|string|string[], options?): Promise<APIResponse<T>>`
+- `delete(schema, entity, id: number|string): Promise<APIResponse<void>>`
+- `getMetadata(schema, entity): Promise<APIResponse<TableMetadata>>`
+
+## HeaderSpecClient (Header-Based REST)
+
+```typescript
+import { HeaderSpecClient, getHeaderSpecClient } from '@warkypublic/resolvespec-js';
+
+const client = new HeaderSpecClient({ baseUrl: 'http://localhost:3000', token: 'your-token' });
+
+// CRUD - HTTP methods: GET=read, POST=create, PUT=update, DELETE=delete
+await client.read('public', 'users', undefined, { columns: ['id', 'name'], limit: 50 });
+await client.create('public', 'users', { name: 'New' });
+await client.update('public', 'users', '42', { name: 'Updated' });
+await client.delete('public', 'users', '42');
+```
+
+**Method signatures:**
+- `read<T>(schema, entity, id?: string, options?): Promise<APIResponse<T>>`
+- `create<T>(schema, entity, data, options?): Promise<APIResponse<T>>`
+- `update<T>(schema, entity, id: string, data, options?): Promise<APIResponse<T>>`
+- `delete(schema, entity, id: string): Promise<APIResponse<void>>`
+
+### Header Mapping
+
+| Header | Options Field | Format |
+|---|---|---|
+| `X-Select-Fields` | `columns` | comma-separated |
+| `X-Not-Select-Fields` | `omit_columns` | comma-separated |
+| `X-FieldFilter-{col}` | `filters` (eq, AND) | value |
+| `X-SearchOp-{op}-{col}` | `filters` (AND) | value |
+| `X-SearchOr-{op}-{col}` | `filters` (OR) | value |
+| `X-Sort` | `sort` | `+col` asc, `-col` desc |
+| `X-Limit` / `X-Offset` | `limit` / `offset` | number |
+| `X-Cursor-Forward` | `cursor_forward` | string |
+| `X-Cursor-Backward` | `cursor_backward` | string |
+| `X-Preload` | `preload` | `Rel:col1,col2` pipe-separated |
+| `X-Fetch-RowNumber` | `fetch_row_number` | string |
+| `X-CQL-SEL-{col}` | `computedColumns` | expression |
+| `X-Custom-SQL-W` | `customOperators` | SQL AND-joined |
+
+### Utility Functions
+
+```typescript
+import { buildHeaders, encodeHeaderValue, decodeHeaderValue } from '@warkypublic/resolvespec-js';
+
+buildHeaders({ columns: ['id', 'name'], limit: 10 });
+// => { 'X-Select-Fields': 'id,name', 'X-Limit': '10' }
+
+encodeHeaderValue('complex value');   // 'ZIP_...' (base64 encoded)
+decodeHeaderValue(encoded);           // original string
+```
+
+## WebSocketClient
+
+```typescript
+import { WebSocketClient, getWebSocketClient } from '@warkypublic/resolvespec-js';
+
+const ws = new WebSocketClient({ url: 'ws://localhost:8080/ws', reconnect: true, heartbeatInterval: 30000 });
+await ws.connect();
+
+// CRUD
+await ws.read('users', { schema: 'public', limit: 10, filters: [...], columns: [...] });
+await ws.create('users', { name: 'New' }, { schema: 'public' });
+await ws.update('users', '1', { name: 'Updated' }, { schema: 'public' });
+await ws.delete('users', '1', { schema: 'public' });
+await ws.meta('users', { schema: 'public' });
+
+// Subscriptions
+const subId = await ws.subscribe('users', (notification) => { ... }, { schema: 'public', filters: [...] });
+await ws.unsubscribe(subId);
+ws.getSubscriptions();
+
+// Connection
+ws.getState();      // 'connecting' | 'connected' | 'disconnecting' | 'disconnected' | 'reconnecting'
+ws.isConnected();
+ws.disconnect();
+
+// Events
+ws.on('connect', () => {});
+ws.on('disconnect', (event: CloseEvent) => {});
+ws.on('error', (error: Error) => {});
+ws.on('message', (message: WSMessage) => {});
+ws.on('stateChange', (state: ConnectionState) => {});
+ws.off('connect');
+```
+
+## Options (Query Parameters)
+
+```typescript
+interface Options {
+  columns?: string[];
+  omit_columns?: string[];
+  filters?: FilterOption[];
+  sort?: SortOption[];
+  limit?: number;
+  offset?: number;
+  preload?: PreloadOption[];
+  customOperators?: CustomOperator[];
+  computedColumns?: ComputedColumn[];
+  parameters?: Parameter[];
+  cursor_forward?: string;
+  cursor_backward?: string;
+  fetch_row_number?: string;
+}
+```
+
+### FilterOption
+
+```typescript
+interface FilterOption {
+  column: string;
+  operator: Operator | string;
+  value: any;
+  logic_operator?: 'AND' | 'OR';
+}
+
+// Operators: eq, neq, gt, gte, lt, lte, like, ilike, in,
+//            contains, startswith, endswith, between,
+//            between_inclusive, is_null, is_not_null
+```
+
+### SortOption
+
+```typescript
+interface SortOption {
+  column: string;
+  direction: 'asc' | 'desc' | 'ASC' | 'DESC';
+}
+```
+
+### PreloadOption
+
+```typescript
+interface PreloadOption {
+  relation: string;
+  table_name?: string;
+  columns?: string[];
+  omit_columns?: string[];
+  sort?: SortOption[];
+  filters?: FilterOption[];
+  where?: string;
+  limit?: number;
+  offset?: number;
+  updatable?: boolean;
+  computed_ql?: Record<string, string>;
+  recursive?: boolean;
+  primary_key?: string;
+  related_key?: string;
+  foreign_key?: string;
+  recursive_child_key?: string;
+  sql_joins?: string[];
+  join_aliases?: string[];
+}
+```
+
+### Other Types
+
+```typescript
+interface ComputedColumn { name: string; expression: string; }
+interface CustomOperator { name: string; sql: string; }
+interface Parameter { name: string; value: string; sequence?: number; }
+```
+
+## Response Types
+
+```typescript
+interface APIResponse<T = any> {
+  success: boolean;
+  data: T;
+  metadata?: Metadata;
+  error?: APIError;
+}
+
+interface APIError { code: string; message: string; details?: any; detail?: string; }
+interface Metadata { total: number; count: number; filtered: number; limit: number; offset: number; row_number?: number; }
+
+interface TableMetadata {
+  schema: string;
+  table: string;
+  columns: Column[];
+  relations: string[];
+}
+
+interface Column { name: string; type: string; is_nullable: boolean; is_primary: boolean; is_unique: boolean; has_index: boolean; }
+```
+
+## WebSocket Message Types
+
+```typescript
+type MessageType = 'request' | 'response' | 'notification' | 'subscription' | 'error' | 'ping' | 'pong';
+type WSOperation = 'read' | 'create' | 'update' | 'delete' | 'subscribe' | 'unsubscribe' | 'meta';
+
+interface WSMessage {
+  id?: string; type: MessageType; operation?: WSOperation;
+  schema?: string; entity?: string; record_id?: string;
+  data?: any; options?: WSOptions; subscription_id?: string;
+  success?: boolean; error?: WSErrorInfo; metadata?: Record<string, any>; timestamp?: string;
+}
+
+interface WSNotificationMessage {
+  type: 'notification'; operation: WSOperation; subscription_id: string;
+  schema?: string; entity: string; data: any; timestamp: string;
+}
+```
+
+## Dependencies
+
+- Runtime: `uuid`
+- Peer: none
+- Node >= 18

llm/docs/zustandsyncstore.md

@@ -0,0 +1,131 @@
+# @warkypublic/zustandsyncstore v1.0.0
+
+React library providing synchronized Zustand stores with prop-based state management and persistence support.
+
+## Peer Dependencies
+
+- `react` >= 19.0.0
+- `zustand` >= 5.0.0
+- `use-sync-external-store` >= 1.4.0
+
+## Runtime Dependencies
+
+- `@warkypublic/artemis-kit`
+
+## API
+
+Single export: `createSyncStore`
+
+```typescript
+import { createSyncStore } from '@warkypublic/zustandsyncstore';
+```
+
+### createSyncStore<TState, TProps>(createState?, useValue?)
+
+**Parameters:**
+- `createState` (optional): Zustand `StateCreator<TState>` function
+- `useValue` (optional): Custom hook receiving `{ useStore, useStoreApi } & TProps`, returns additional state to merge
+
+**Returns:** `SyncStoreReturn<TState, TProps>` containing:
+- `Provider` — React context provider component
+- `useStore` — Hook to access the store
+
+### Provider Props
+
+| Prop | Type | Description |
+|---|---|---|
+| `children` | `ReactNode` | Required |
+| `firstSyncProps` | `string[]` | Props to sync only on first render |
+| `persist` | `PersistOptions<Partial<TProps & TState>>` | Zustand persist config |
+| `waitForSync` | `boolean` | Wait for sync before rendering children |
+| `fallback` | `ReactNode` | Shown while waiting for sync |
+| `...TProps` | `TProps` | Custom props synced to store state |
+
+### useStore Hook
+
+```typescript
+const state = useStore();                                    // entire state (TState & TProps)
+const count = useStore(state => state.count);                // with selector
+const count = useStore(state => state.count, (a, b) => a === b);  // with equality fn
+```
+
+## Usage
+
+### Basic
+
+```tsx
+interface MyState { count: number; increment: () => void; }
+interface MyProps { initialCount: number; }
+
+const { Provider, useStore } = createSyncStore<MyState, MyProps>(
+  (set) => ({
+    count: 0,
+    increment: () => set((state) => ({ count: state.count + 1 })),
+  })
+);
+
+function Counter() {
+  const { count, increment } = useStore();
+  return <button onClick={increment}>Count: {count}</button>;
+}
+
+function App() {
+  return (
+    <Provider initialCount={10}>
+      <Counter />
+    </Provider>
+  );
+}
+```
+
+### With Custom Hook Logic
+
+```tsx
+const { Provider, useStore } = createSyncStore<MyState, MyProps>(
+  (set) => ({ count: 0, increment: () => set((s) => ({ count: s.count + 1 })) }),
+  ({ useStore, useStoreApi, initialCount }) => {
+    const currentCount = useStore(state => state.count);
+    return { computedValue: initialCount * 2 };
+  }
+);
+```
+
+### With Persistence
+
+```tsx
+<Provider initialCount={10} persist={{ name: 'my-store', storage: localStorage }}>
+  <Counter />
+</Provider>
+```
+
+### Selective Prop Syncing
+
+```tsx
+<Provider initialCount={10} otherProp="value" firstSyncProps={['initialCount']}>
+  <Counter />
+</Provider>
+```
+
+## Internal Types
+
+```typescript
+type LocalUseStore<TState, TProps> = TState & TProps;
+
+// Store state includes a $sync method for internal prop syncing
+type InternalStoreState<TState, TProps> = TState & TProps & {
+  $sync: (props: TProps) => void;
+};
+
+type SyncStoreReturn<TState, TProps> = {
+  Provider: (props: { children: ReactNode } & {
+    firstSyncProps?: string[];
+    persist?: PersistOptions<Partial<TProps & TState>>;
+    waitForSync?: boolean;
+    fallback?: ReactNode;
+  } & TProps) => React.ReactNode;
+  useStore: {
+    (): LocalUseStore<TState, TProps>;
+    <U>(selector: (state: LocalUseStore<TState, TProps>) => U, equalityFn?: (a: U, b: U) => boolean): U;
+  };
+};
+```

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@warkypublic/oranguru",
   "author": "Warky Devs",
-  "version": "0.0.42",
+  "version": "0.0.49",
   "type": "module",
   "types": "./dist/lib.d.ts",
   "main": "./dist/lib.cjs.js",
@@ -48,34 +48,38 @@
     "url": "git+https://git.warky.dev/wdevs/oranguru.git"
   },
   "dependencies": {
-    "@modelcontextprotocol/sdk": "^1.0.4",
+    "@mantine/dates": "^8.3.14",
+    "@modelcontextprotocol/sdk": "^1.26.0",
+    "@tanstack/react-table": "^8.21.3",
     "@tanstack/react-virtual": "^3.13.18",
+    "dayjs": "^1.11.19",
     "moment": "^2.30.1"
   },
   "devDependencies": {
     "@changesets/changelog-git": "^0.2.1",
     "@changesets/cli": "^2.29.8",
-    "@eslint/js": "^9.39.2",
-    "@microsoft/api-extractor": "^7.56.0",
+    "@eslint/js": "^10.0.1",
+    "@microsoft/api-extractor": "^7.56.3",
+    "@playwright/test": "^1.58.2",
     "@sentry/react": "^10.38.0",
-    "@storybook/react-vite": "^10.2.3",
+    "@storybook/react-vite": "^10.2.8",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.2",
     "@testing-library/user-event": "^14.6.1",
     "@types/jsdom": "~27.0.0",
-    "@types/node": "^25.2.0",
-    "@types/react": "^19.2.10",
+    "@types/node": "^25.2.3",
+    "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "@types/use-sync-external-store": "~1.5.0",
-    "@typescript-eslint/parser": "^8.54.0",
+    "@typescript-eslint/parser": "^8.55.0",
     "@vitejs/plugin-react-swc": "^4.2.3",
-    "eslint": "^9.39.2",
+    "eslint": "^10.0.0",
     "eslint-config-mantine": "^4.0.3",
-    "eslint-plugin-perfectionist": "^5.4.0",
+    "eslint-plugin-perfectionist": "^5.5.0",
     "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.5.0",
-    "eslint-plugin-storybook": "^10.2.3",
+    "eslint-plugin-storybook": "^10.2.8",
     "global": "^4.4.0",
     "globals": "^17.3.0",
     "jiti": "^2.6.1",
@@ -87,12 +91,12 @@
     "prettier-eslint": "^16.4.2",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
-    "storybook": "^10.2.3",
+    "storybook": "^10.2.8",
     "typescript": "~5.9.3",
-    "typescript-eslint": "^8.54.0",
+    "typescript-eslint": "^8.55.0",
     "vite": "^7.3.1",
     "vite-plugin-dts": "^4.5.4",
-    "vite-tsconfig-paths": "^6.0.5",
+    "vite-tsconfig-paths": "^6.1.1",
     "vitest": "^4.0.18"
   },
   "peerDependencies": {
@@ -103,8 +107,10 @@
     "@mantine/notifications": "^8.3.5",
     "@tabler/icons-react": "^3.35.0",
     "@tanstack/react-query": "^5.90.5",
+    "@tanstack/react-table": "^8.21.3",
     "@warkypublic/artemis-kit": "^1.0.10",
-    "@warkypublic/zustandsyncstore": "^0.0.4",
+    "@warkypublic/zustandsyncstore": "^1.0.0",
+    "@warkypublic/resolvespec-js": "^1.0.1",
     "idb-keyval": "^6.2.2",
     "immer": "^10.1.3",
     "react": ">= 19.0.0",

playwright.config.ts

@@ -0,0 +1,23 @@
+import { defineConfig, devices } from '@playwright/test';
+
+export default defineConfig({
+  forbidOnly: !!process.env.CI,
+  fullyParallel: true,
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+  ],
+  reporter: 'html',
+  retries: process.env.CI ? 2 : 0,
+  testDir: './tests/e2e',
+  use: {
+    baseURL: 'http://localhost:6006',
+    trace: 'on-first-retry',
+  },
+
+  webServer: undefined,
+
+  workers: process.env.CI ? 1 : undefined,
+});

src/Former/use-former-state.tsx

@@ -31,7 +31,7 @@ export const useFormerState = <T extends FieldValues = FieldValues>(
     former: { ...formerProps, onChange },
     formerWrapper: { onClose, opened } as {
       onClose: Required<UseFormerStateProps<T>>['onClose'];
-      opened: UseFormerStateProps<T>['opened'];
+      opened: Required<UseFormerStateProps<T>>['opened'];
     },
     open: (request: UseFormerStateProps<T>['request'], data: UseFormerStateProps<T>['values']) => {
       setState((cv) => ({ ...cv, opened: true, primeData: data, request, values: data }));

src/Griddy/CONTEXT.md

@@ -0,0 +1,195 @@
+# Griddy - Implementation Context
+
+## What Is This
+Griddy is a data grid component in the Oranguru package (`@warkypublic/oranguru`), built on TanStack Table + TanStack Virtual with Zustand state management.
+
+## Architecture
+
+### Two TanStack Libraries
+- **@tanstack/react-table** (headless table model): sorting, filtering, pagination, row selection, column visibility, grouping
+- **@tanstack/react-virtual** (virtualization): renders only visible rows from the table's row model
+
+### State Management
+- **createSyncStore** from `@warkypublic/zustandsyncstore`
+- `GriddyProvider` wraps children; props auto-sync into the store via `$sync`
+- `useGriddyStore((s) => s.fieldName)` to read any prop or UI state
+- `GriddyStoreState` must explicitly declare all prop fields from `GriddyProps` for TypeScript visibility
+- UI state (focus, edit mode, search overlay, selection mode) lives in the store
+- TanStack Table/Virtual instances stored as `_table`, `_virtualizer` in the store
+
+### Component Tree
+```
+<Griddy props>                        // forwardRef wrapper
+  <GriddyProvider {...props}>         // createSyncStore Provider, syncs all props
+    <GriddyErrorBoundary>             // class-based error boundary with retry
+      <GriddyInner>                   // sets up useReactTable + useVirtualizer
+        <SearchOverlay />             // Ctrl+F search (with search history)
+        <AdvancedSearchPanel />       // multi-condition boolean search
+        <GridToolbar />               // export, column visibility, filter presets
+        <div tabIndex={0}>            // scroll container, keyboard target
+          <TableHeader />             // headers, sort indicators, filter popovers
+          <GriddyLoadingSkeleton />   // shown when isLoading && no data
+          <VirtualBody />             // maps virtualizer items -> TableRow
+            <TableRow />             // focus/selection CSS, click handler
+              <TableCell />          // flexRender, editors, custom renderers
+          <GriddyLoadingOverlay />   // translucent overlay when loading with data
+        </div>
+        <PaginationControl />         // page nav, page size selector
+      </GriddyInner>
+    </GriddyErrorBoundary>
+  </GriddyProvider>
+</Griddy>
+```
+
+## File Structure
+```
+src/Griddy/
+├── core/
+│   ├── Griddy.tsx              # Main component, useReactTable + useVirtualizer
+│   ├── GriddyStore.ts          # Zustand store (createSyncStore)
+│   ├── types.ts                # All interfaces: GriddyColumn, GriddyProps, GriddyRef, etc.
+│   ├── columnMapper.ts         # GriddyColumn -> TanStack ColumnDef, checkbox column
+│   └── constants.ts            # CSS class names, defaults (row height 36, overscan 10)
+├── rendering/
+│   ├── VirtualBody.tsx         # Virtual row rendering
+│   ├── TableHeader.tsx         # Headers, sort, resize, filter popovers, drag reorder
+│   ├── TableRow.tsx            # Row with focus/selection styling
+│   ├── TableCell.tsx           # Cell via flexRender, checkbox, editing
+│   ├── EditableCell.tsx        # Editor mounting wrapper
+│   └── hooks/
+│       └── useGridVirtualizer.ts
+├── editors/
+│   ├── TextEditor.tsx, NumericEditor.tsx, DateEditor.tsx
+│   ├── SelectEditor.tsx, CheckboxEditor.tsx
+│   ├── types.ts, index.ts
+├── features/
+│   ├── errorBoundary/
+│   │   └── GriddyErrorBoundary.tsx   # Class-based, onError/onRetry callbacks
+│   ├── loading/
+│   │   └── GriddyLoadingSkeleton.tsx  # Skeleton rows + overlay spinner
+│   ├── renderers/
+│   │   ├── ProgressBarRenderer.tsx    # Percentage bar via rendererMeta
+│   │   ├── BadgeRenderer.tsx          # Colored pill badges
+│   │   ├── ImageRenderer.tsx          # Thumbnail images
+│   │   └── SparklineRenderer.tsx      # SVG polyline sparklines
+│   ├── filtering/
+│   │   ├── ColumnFilterPopover.tsx    # Filter UI with quick filter integration
+│   │   ├── ColumnFilterButton.tsx     # Filter icon (forwardRef, onClick toggle)
+│   │   ├── ColumnFilterContextMenu.tsx # Right-click: Sort, Open Filters
+│   │   ├── FilterInput.tsx, FilterSelect.tsx, FilterBoolean.tsx, FilterDate.tsx
+│   │   ├── filterFunctions.ts, operators.ts, types.ts
+│   ├── quickFilter/
+│   │   └── QuickFilterDropdown.tsx    # Checkbox list of unique column values
+│   ├── advancedSearch/
+│   │   ├── AdvancedSearchPanel.tsx    # Multi-condition search panel
+│   │   ├── SearchConditionRow.tsx     # Single condition: column + operator + value
+│   │   ├── advancedFilterFn.ts       # AND/OR/NOT filter logic
+│   │   └── types.ts
+│   ├── filterPresets/
+│   │   ├── FilterPresetsMenu.tsx      # Save/load/delete presets dropdown
+│   │   ├── useFilterPresets.ts        # localStorage CRUD hook
+│   │   └── types.ts
+│   ├── search/
+│   │   └── SearchOverlay.tsx          # Ctrl+F search with history integration
+│   ├── searchHistory/
+│   │   ├── SearchHistoryDropdown.tsx   # Recent searches dropdown
+│   │   └── useSearchHistory.ts        # localStorage hook (last 10 searches)
+│   ├── keyboard/
+│   │   └── useKeyboardNavigation.ts
+│   ├── pagination/
+│   │   └── PaginationControl.tsx
+│   ├── toolbar/
+│   │   └── GridToolbar.tsx            # Export, column visibility, filter presets
+│   ├── export/
+│   │   └── exportCsv.ts
+│   └── columnVisibility/
+│       └── ColumnVisibilityMenu.tsx
+├── styles/
+│   └── griddy.module.css
+├── index.ts
+└── Griddy.stories.tsx          # 31 stories covering all features
+
+tests/e2e/
+├── filtering-context-menu.spec.ts   # 8 tests for Phase 5 filtering
+└── griddy-features.spec.ts          # 26 tests for Phase 10 features
+```
+
+## Key Props (GriddyProps<T>)
+| Prop | Type | Purpose |
+|------|------|---------|
+| `data` | `T[]` | Data array |
+| `columns` | `GriddyColumn<T>[]` | Column definitions |
+| `selection` | `SelectionConfig` | none/single/multi row selection |
+| `search` | `SearchConfig` | Ctrl+F search overlay |
+| `advancedSearch` | `{ enabled }` | Multi-condition search panel |
+| `pagination` | `PaginationConfig` | Client/server-side pagination |
+| `grouping` | `GroupingConfig` | Data grouping |
+| `isLoading` | `boolean` | Show skeleton/overlay |
+| `showToolbar` | `boolean` | Export + column visibility toolbar |
+| `filterPresets` | `boolean` | Save/load filter presets |
+| `onError` | `(error) => void` | Error boundary callback |
+| `onRetry` | `() => void` | Error boundary retry callback |
+| `onEditCommit` | `(rowId, colId, value) => void` | Edit callback |
+| `manualSorting/manualFiltering` | `boolean` | Server-side mode |
+| `persistenceKey` | `string` | localStorage key for presets/history |
+
+## GriddyColumn<T> Key Fields
+| Field | Purpose |
+|-------|---------|
+| `renderer` | Custom cell renderer (wired via columnMapper `def.cell`) |
+| `rendererMeta` | Metadata for built-in renderers (colorMap, max, etc.) |
+| `filterConfig` | `{ type, quickFilter?, enumOptions? }` |
+| `editable` | `boolean \| (row) => boolean` |
+| `editorConfig` | Editor-specific config (options, min, max, etc.) |
+| `pinned` | `'left' \| 'right'` |
+| `headerGroup` | Groups columns under parent header |
+
+## Keyboard Bindings
+- Arrow Up/Down: move focus
+- Page Up/Down: jump by visible page
+- Home/End: first/last row
+- Space: toggle selection
+- Shift+Arrow: extend multi-selection
+- Ctrl+A: select all (multi mode)
+- Ctrl+F: open search overlay
+- Ctrl+E / Enter: enter edit mode
+- Escape: close search / cancel edit / clear selection
+
+## Gotchas / Bugs Fixed
+1. **Hooks violation in VirtualBody**: `useEffect` was after early `return null`. All hooks must run before any conditional return.
+2. **sortingFn crash**: Setting `sortingFn: undefined` explicitly overrides TanStack's auto-detection. Fix: use `accessorKey` for string accessors.
+3. **createSyncStore typing**: Props synced at runtime via `$sync` but TypeScript only sees `GriddyStoreState`. All prop fields must be declared in store state interface.
+4. **useGriddyStore has no .getState()**: Context-based hook, not vanilla zustand. Use `useRef` for imperative access.
+5. **globalFilterFn: undefined breaks search**: Explicitly setting `globalFilterFn: undefined` disables global filtering. Use conditional spread: `...(advancedSearch?.enabled ? { globalFilterFn } : {})`.
+6. **Custom renderers not rendering**: `columnMapper.ts` must wire `GriddyColumn.renderer` into TanStack's `ColumnDef.cell`.
+7. **Error boundary retry timing**: `onRetry` parent setState must flush before error boundary clears. Use `setTimeout(0)` to defer `setState({ error: null })`.
+8. **ColumnFilterButton must forwardRef**: Mantine's `Popover.Target` requires child to forward refs.
+9. **Filter popover click propagation**: Clicking filter icon bubbles to header cell (triggers sort). Fix: explicit `onClick` with `stopPropagation` on ColumnFilterButton, not relying on Mantine Popover.Target auto-toggle.
+10. **header.getAfter('right')**: Method exists on `Column`, not `Header`. Use `header.column.getAfter('right')`.
+
+## UI Components
+Uses **Mantine** components:
+- `Checkbox`, `TextInput`, `ActionIcon`, `Popover`, `Menu`, `Button`, `Group`, `Stack`, `Text`
+- `Select`, `MultiSelect`, `NumberInput`, `Radio`, `SegmentedControl`, `ScrollArea`
+- `@mantine/dates` for DatePickerInput
+- `@tabler/icons-react` for icons
+
+## Implementation Status
+- [x] Phase 1-9: Core, virtualization, selection, search, filtering, editing, pagination, advanced features, polish
+- [x] Phase 7.5: Infinite scroll
+- [x] Phase 8 completion: Column pinning, header grouping, data grouping, column reordering
+- [x] Phase 10 (partial): Error boundary, loading states, custom renderers, quick filters, advanced search, filter presets, search history
+- [ ] Phase 10 remaining: See plan.md
+
+## E2E Tests
+- **34 total Playwright tests** (8 filtering + 26 feature tests)
+- All passing against Storybook at `http://localhost:6006`
+- Run: `npx playwright test` (requires Storybook running)
+
+## Commands
+```bash
+pnpm run typecheck && pnpm run build   # Build check
+pnpm run storybook                      # Start Storybook
+npx playwright test                     # Run E2E tests
+npx playwright test tests/e2e/griddy-features.spec.ts  # Phase 10 tests only
+```

src/Griddy/EXAMPLES.md

@@ -0,0 +1,471 @@
+# Griddy Examples
+
+## Table of Contents
+
+1. [Basic Grid](#basic-grid)
+2. [Editable Grid](#editable-grid)
+3. [Searchable Grid](#searchable-grid)
+4. [Filtered Grid](#filtered-grid)
+5. [Paginated Grid](#paginated-grid)
+6. [Server-Side Grid](#server-side-grid)
+7. [Custom Renderers](#custom-renderers)
+8. [Selection](#selection)
+9. [TypeScript Integration](#typescript-integration)
+
+## Basic Grid
+
+```typescript
+import { Griddy, type GriddyColumn } from '@warkypublic/oranguru'
+
+interface Product {
+  id: number
+  name: string
+  price: number
+  inStock: boolean
+}
+
+const columns: GriddyColumn<Product>[] = [
+  { id: 'id', accessor: 'id', header: 'ID', width: 60 },
+  { id: 'name', accessor: 'name', header: 'Product Name', width: 200, sortable: true },
+  { id: 'price', accessor: 'price', header: 'Price', width: 100, sortable: true },
+  { id: 'inStock', accessor: row => row.inStock ? 'Yes' : 'No', header: 'In Stock', width: 100 },
+]
+
+const data: Product[] = [
+  { id: 1, name: 'Laptop', price: 999, inStock: true },
+  { id: 2, name: 'Mouse', price: 29, inStock: false },
+]
+
+export function ProductGrid() {
+  return (
+    <Griddy
+      columns={columns}
+      data={data}
+      height={500}
+      getRowId={(row) => String(row.id)}
+    />
+  )
+}
+```
+
+## Editable Grid
+
+```typescript
+import { useState } from 'react'
+import { Griddy, type GriddyColumn } from '@warkypublic/oranguru'
+
+interface User {
+  id: number
+  firstName: string
+  lastName: string
+  age: number
+  role: string
+}
+
+export function EditableUserGrid() {
+  const [users, setUsers] = useState<User[]>([
+    { id: 1, firstName: 'John', lastName: 'Doe', age: 30, role: 'Admin' },
+    { id: 2, firstName: 'Jane', lastName: 'Smith', age: 25, role: 'User' },
+  ])
+
+  const columns: GriddyColumn<User>[] = [
+    { id: 'id', accessor: 'id', header: 'ID', width: 60 },
+    {
+      id: 'firstName',
+      accessor: 'firstName',
+      header: 'First Name',
+      width: 150,
+      editable: true,
+      editorConfig: { type: 'text' },
+    },
+    {
+      id: 'lastName',
+      accessor: 'lastName',
+      header: 'Last Name',
+      width: 150,
+      editable: true,
+      editorConfig: { type: 'text' },
+    },
+    {
+      id: 'age',
+      accessor: 'age',
+      header: 'Age',
+      width: 80,
+      editable: true,
+      editorConfig: { type: 'number', min: 18, max: 120 },
+    },
+    {
+      id: 'role',
+      accessor: 'role',
+      header: 'Role',
+      width: 120,
+      editable: true,
+      editorConfig: {
+        type: 'select',
+        options: [
+          { label: 'Admin', value: 'Admin' },
+          { label: 'User', value: 'User' },
+          { label: 'Guest', value: 'Guest' },
+        ],
+      },
+    },
+  ]
+
+  const handleEditCommit = async (rowId: string, columnId: string, value: unknown) => {
+    setUsers(prev => prev.map(user =>
+      String(user.id) === rowId
+        ? { ...user, [columnId]: value }
+        : user
+    ))
+  }
+
+  return (
+    <Griddy
+      columns={columns}
+      data={users}
+      height={500}
+      getRowId={(row) => String(row.id)}
+      onEditCommit={handleEditCommit}
+    />
+  )
+}
+```
+
+## Searchable Grid
+
+```typescript
+import { Griddy, type GriddyColumn } from '@warkypublic/oranguru'
+
+export function SearchableGrid() {
+  const columns: GriddyColumn<Person>[] = [
+    { id: 'name', accessor: 'name', header: 'Name', width: 150, searchable: true },
+    { id: 'email', accessor: 'email', header: 'Email', width: 250, searchable: true },
+    { id: 'department', accessor: 'department', header: 'Department', width: 150 },
+  ]
+
+  return (
+    <Griddy
+      columns={columns}
+      data={data}
+      height={500}
+      search={{
+        enabled: true,
+        highlightMatches: true,
+        placeholder: 'Search by name or email...',
+      }}
+    />
+  )
+}
+```
+
+## Filtered Grid
+
+```typescript
+import { useState } from 'react'
+import { Griddy, type GriddyColumn } from '@warkypublic/oranguru'
+import type { ColumnFiltersState } from '@tanstack/react-table'
+
+export function FilteredGrid() {
+  const [filters, setFilters] = useState<ColumnFiltersState>([])
+
+  const columns: GriddyColumn<Person>[] = [
+    {
+      id: 'name',
+      accessor: 'name',
+      header: 'Name',
+      filterable: true,
+      filterConfig: { type: 'text' },
+      width: 150,
+    },
+    {
+      id: 'age',
+      accessor: 'age',
+      header: 'Age',
+      filterable: true,
+      filterConfig: { type: 'number' },
+      width: 80,
+    },
+    {
+      id: 'department',
+      accessor: 'department',
+      header: 'Department',
+      filterable: true,
+      filterConfig: {
+        type: 'enum',
+        enumOptions: [
+          { label: 'Engineering', value: 'Engineering' },
+          { label: 'Marketing', value: 'Marketing' },
+          { label: 'Sales', value: 'Sales' },
+        ],
+      },
+      width: 150,
+    },
+  ]
+
+  return (
+    <Griddy
+      columns={columns}
+      data={data}
+      height={500}
+      columnFilters={filters}
+      onColumnFiltersChange={setFilters}
+    />
+  )
+}
+```
+
+## Paginated Grid
+
+```typescript
+import { Griddy, type GriddyColumn } from '@warkypublic/oranguru'
+
+export function PaginatedGrid() {
+  const columns: GriddyColumn<Person>[] = [
+    { id: 'id', accessor: 'id', header: 'ID', width: 60 },
+    { id: 'name', accessor: 'name', header: 'Name', width: 150 },
+    { id: 'email', accessor: 'email', header: 'Email', width: 250 },
+  ]
+
+  return (
+    <Griddy
+      columns={columns}
+      data={largeDataset}
+      height={500}
+      pagination={{
+        enabled: true,
+        pageSize: 25,
+        pageSizeOptions: [10, 25, 50, 100],
+      }}
+    />
+  )
+}
+```
+
+## Server-Side Grid
+
+```typescript
+import { useState, useEffect } from 'react'
+import { Griddy, type GriddyColumn } from '@warkypublic/oranguru'
+import type { ColumnFiltersState, SortingState } from '@tanstack/react-table'
+
+export function ServerSideGrid() {
+  const [data, setData] = useState([])
+  const [totalCount, setTotalCount] = useState(0)
+  const [filters, setFilters] = useState<ColumnFiltersState>([])
+  const [sorting, setSorting] = useState<SortingState>([])
+  const [pageIndex, setPageIndex] = useState(0)
+  const [pageSize, setPageSize] = useState(25)
+  const [isLoading, setIsLoading] = useState(false)
+
+  // Fetch data when filters, sorting, or pagination changes
+  useEffect(() => {
+    const fetchData = async () => {
+      setIsLoading(true)
+      try {
+        const response = await fetch('/api/users', {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({
+            filters,
+            sorting,
+            pagination: { pageIndex, pageSize },
+          }),
+        })
+        const result = await response.json()
+        setData(result.data)
+        setTotalCount(result.total)
+      } finally {
+        setIsLoading(false)
+      }
+    }
+
+    fetchData()
+  }, [filters, sorting, pageIndex, pageSize])
+
+  const columns: GriddyColumn<Person>[] = [
+    {
+      id: 'name',
+      accessor: 'name',
+      header: 'Name',
+      sortable: true,
+      filterable: true,
+      filterConfig: { type: 'text' },
+      width: 150,
+    },
+    // ... more columns
+  ]
+
+  return (
+    <Griddy
+      columns={columns}
+      data={data}
+      dataCount={totalCount}
+      height={500}
+      manualSorting
+      manualFiltering
+      columnFilters={filters}
+      onColumnFiltersChange={setFilters}
+      sorting={sorting}
+      onSortingChange={setSorting}
+      pagination={{
+        enabled: true,
+        pageSize,
+        pageSizeOptions: [10, 25, 50, 100],
+        onPageChange: setPageIndex,
+        onPageSizeChange: (size) => {
+          setPageSize(size)
+          setPageIndex(0)
+        },
+      }}
+    />
+  )
+}
+```
+
+## Custom Renderers
+
+```typescript
+import { Griddy, type GriddyColumn, type CellRenderer } from '@warkypublic/oranguru'
+import { Badge } from '@mantine/core'
+
+interface Order {
+  id: number
+  customer: string
+  amount: number
+  status: 'pending' | 'shipped' | 'delivered'
+}
+
+const StatusRenderer: CellRenderer<Order> = ({ value }) => {
+  const color = value === 'delivered' ? 'green' : value === 'shipped' ? 'blue' : 'yellow'
+  return <Badge color={color}>{String(value)}</Badge>
+}
+
+const AmountRenderer: CellRenderer<Order> = ({ value }) => {
+  const amount = Number(value)
+  const color = amount > 1000 ? 'green' : 'gray'
+  return <span style={{ color, fontWeight: 600 }}>${amount.toFixed(2)}</span>
+}
+
+export function OrderGrid() {
+  const columns: GriddyColumn<Order>[] = [
+    { id: 'id', accessor: 'id', header: 'Order ID', width: 100 },
+    { id: 'customer', accessor: 'customer', header: 'Customer', width: 200 },
+    {
+      id: 'amount',
+      accessor: 'amount',
+      header: 'Amount',
+      width: 120,
+      renderer: AmountRenderer,
+    },
+    {
+      id: 'status',
+      accessor: 'status',
+      header: 'Status',
+      width: 120,
+      renderer: StatusRenderer,
+    },
+  ]
+
+  return <Griddy columns={columns} data={orders} height={500} />
+}
+```
+
+## Selection
+
+```typescript
+import { useState } from 'react'
+import { Griddy, type GriddyColumn } from '@warkypublic/oranguru'
+import type { RowSelectionState } from '@tanstack/react-table'
+
+export function SelectableGrid() {
+  const [selection, setSelection] = useState<RowSelectionState>({})
+
+  const columns: GriddyColumn<Person>[] = [
+    { id: 'name', accessor: 'name', header: 'Name', width: 150 },
+    { id: 'email', accessor: 'email', header: 'Email', width: 250 },
+  ]
+
+  const selectedRows = Object.keys(selection).filter(key => selection[key])
+
+  return (
+    <>
+      <Griddy
+        columns={columns}
+        data={data}
+        height={500}
+        rowSelection={selection}
+        onRowSelectionChange={setSelection}
+        selection={{
+          mode: 'multi',
+          showCheckbox: true,
+          selectOnClick: true,
+        }}
+      />
+      <div>Selected: {selectedRows.length} rows</div>
+    </>
+  )
+}
+```
+
+## TypeScript Integration
+
+```typescript
+// Define your data type
+interface Employee {
+  id: number
+  firstName: string
+  lastName: string
+  email: string
+  department: string
+  salary: number
+  hireDate: string
+  isActive: boolean
+}
+
+// Type-safe column definition
+const columns: GriddyColumn<Employee>[] = [
+  {
+    id: 'id',
+    accessor: 'id', // Type-checked against Employee keys
+    header: 'ID',
+    width: 60,
+  },
+  {
+    id: 'fullName',
+    accessor: (row) => `${row.firstName} ${row.lastName}`, // Type-safe accessor function
+    header: 'Full Name',
+    width: 200,
+  },
+  {
+    id: 'salary',
+    accessor: 'salary',
+    header: 'Salary',
+    width: 120,
+    renderer: ({ value }) => `$${Number(value).toLocaleString()}`,
+  },
+]
+
+// Type-safe component
+export function EmployeeGrid() {
+  const [employees, setEmployees] = useState<Employee[]>([])
+
+  const handleEdit = async (rowId: string, columnId: string, value: unknown) => {
+    // TypeScript knows employees is Employee[]
+    setEmployees(prev => prev.map(emp =>
+      String(emp.id) === rowId
+        ? { ...emp, [columnId]: value }
+        : emp
+    ))
+  }
+
+  return (
+    <Griddy<Employee>
+      columns={columns}
+      data={employees}
+      height={600}
+      getRowId={(row) => String(row.id)}
+      onEditCommit={handleEdit}
+    />
+  )
+}
+```

src/Griddy/README.md

@@ -0,0 +1,289 @@
+# Griddy
+
+A powerful, keyboard-first data grid component built on **TanStack Table** and **TanStack Virtual** with full TypeScript support.
+
+## Features
+
+✨ **Core Features**
+- 🎹 **Keyboard-first navigation** - Arrow keys, Page Up/Down, Home/End, Ctrl+F
+- 🚀 **Virtual scrolling** - Handle 10,000+ rows smoothly
+- 📝 **Inline editing** - 5 built-in editors (text, number, date, select, checkbox)
+- 🔍 **Search** - Ctrl+F overlay with highlighting
+- 🎯 **Row selection** - Single and multi-select modes with keyboard support
+- 📊 **Sorting** - Single and multi-column sorting
+- 🔎 **Filtering** - Text, number, date, enum, boolean filters with operators
+- 📄 **Pagination** - Client-side and server-side pagination
+- 💾 **CSV Export** - Export filtered data to CSV
+- 👁️ **Column visibility** - Show/hide columns dynamically
+
+🎨 **Advanced Features**
+- Server-side filtering/sorting/pagination
+- Customizable cell renderers
+- Custom editors
+- Theme system with CSS variables
+- Fully accessible (ARIA compliant)
+
+## Installation
+
+```bash
+pnpm add @warkypublic/oranguru @tanstack/react-table @tanstack/react-virtual @mantine/core @mantine/dates
+```
+
+## Quick Start
+
+```typescript
+import { Griddy } from '@warkypublic/oranguru'
+import type { GriddyColumn } from '@warkypublic/oranguru'
+
+interface Person {
+  id: number
+  name: string
+  age: number
+  email: string
+}
+
+const columns: GriddyColumn<Person>[] = [
+  { id: 'id', accessor: 'id', header: 'ID', width: 60 },
+  { id: 'name', accessor: 'name', header: 'Name', width: 150, sortable: true },
+  { id: 'age', accessor: 'age', header: 'Age', width: 80, sortable: true },
+  { id: 'email', accessor: 'email', header: 'Email', width: 250 },
+]
+
+const data: Person[] = [
+  { id: 1, name: 'Alice', age: 28, email: 'alice@example.com' },
+  { id: 2, name: 'Bob', age: 32, email: 'bob@example.com' },
+]
+
+function MyGrid() {
+  return (
+    <Griddy
+      columns={columns}
+      data={data}
+      height={400}
+      getRowId={(row) => String(row.id)}
+    />
+  )
+}
+```
+
+## API Reference
+
+### GriddyProps
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `columns` | `GriddyColumn<T>[]` | **required** | Column definitions |
+| `data` | `T[]` | **required** | Data array |
+| `height` | `number \| string` | `'100%'` | Container height |
+| `getRowId` | `(row: T, index: number) => string` | `(_, i) => String(i)` | Row ID function |
+| `rowHeight` | `number` | `36` | Row height in pixels |
+| `overscan` | `number` | `10` | Overscan row count |
+| `keyboardNavigation` | `boolean` | `true` | Enable keyboard shortcuts |
+| `selection` | `SelectionConfig` | - | Row selection config |
+| `search` | `SearchConfig` | - | Search config |
+| `pagination` | `PaginationConfig` | - | Pagination config |
+| `showToolbar` | `boolean` | `false` | Show toolbar (export + column visibility) |
+| `exportFilename` | `string` | `'export.csv'` | CSV export filename |
+| `manualSorting` | `boolean` | `false` | Server-side sorting |
+| `manualFiltering` | `boolean` | `false` | Server-side filtering |
+| `dataCount` | `number` | - | Total row count (for server-side pagination) |
+
+### Column Definition
+
+```typescript
+interface GriddyColumn<T> {
+  id: string
+  accessor: keyof T | ((row: T) => any)
+  header: string | ReactNode
+  width?: number
+  minWidth?: number
+  maxWidth?: number
+  sortable?: boolean
+  filterable?: boolean
+  filterConfig?: FilterConfig
+  editable?: boolean
+  editorConfig?: EditorConfig
+  renderer?: CellRenderer<T>
+  hidden?: boolean
+  pinned?: 'left' | 'right'
+}
+```
+
+### Keyboard Shortcuts
+
+| Key | Action |
+|-----|--------|
+| `Arrow Up/Down` | Move focus between rows |
+| `Page Up/Down` | Jump by visible page size |
+| `Home / End` | Jump to first/last row |
+| `Space` | Toggle row selection |
+| `Shift + Arrow` | Extend selection (multi-select) |
+| `Ctrl + A` | Select all rows |
+| `Ctrl + F` | Open search overlay |
+| `Ctrl + E` / `Enter` | Start editing |
+| `Escape` | Cancel edit / close search / clear selection |
+
+## Examples
+
+### With Editing
+
+```typescript
+const editableColumns: GriddyColumn<Person>[] = [
+  {
+    id: 'name',
+    accessor: 'name',
+    header: 'Name',
+    editable: true,
+    editorConfig: { type: 'text' },
+  },
+  {
+    id: 'age',
+    accessor: 'age',
+    header: 'Age',
+    editable: true,
+    editorConfig: { type: 'number', min: 0, max: 120 },
+  },
+]
+
+<Griddy
+  columns={editableColumns}
+  data={data}
+  onEditCommit={(rowId, columnId, value) => {
+    // Update your data
+    setData(prev => prev.map(row =>
+      row.id === rowId ? { ...row, [columnId]: value } : row
+    ))
+  }}
+/>
+```
+
+### With Filtering
+
+```typescript
+const filterableColumns: GriddyColumn<Person>[] = [
+  {
+    id: 'name',
+    accessor: 'name',
+    header: 'Name',
+    filterable: true,
+    filterConfig: { type: 'text' },
+  },
+  {
+    id: 'age',
+    accessor: 'age',
+    header: 'Age',
+    filterable: true,
+    filterConfig: { type: 'number' },
+  },
+]
+
+<Griddy
+  columns={filterableColumns}
+  data={data}
+  columnFilters={filters}
+  onColumnFiltersChange={setFilters}
+/>
+```
+
+### With Pagination
+
+```typescript
+<Griddy
+  columns={columns}
+  data={data}
+  pagination={{
+    enabled: true,
+    pageSize: 25,
+    pageSizeOptions: [10, 25, 50, 100],
+  }}
+/>
+```
+
+### Server-Side Mode
+
+```typescript
+const [serverData, setServerData] = useState([])
+const [filters, setFilters] = useState([])
+const [sorting, setSorting] = useState([])
+
+useEffect(() => {
+  // Fetch from server when filters/sorting change
+  fetchData({ filters, sorting }).then(setServerData)
+}, [filters, sorting])
+
+<Griddy
+  columns={columns}
+  data={serverData}
+  manualFiltering
+  manualSorting
+  columnFilters={filters}
+  onColumnFiltersChange={setFilters}
+  sorting={sorting}
+  onSortingChange={setSorting}
+/>
+```
+
+## Theming
+
+Griddy uses CSS variables for theming:
+
+```css
+.griddy {
+  --griddy-font-family: inherit;
+  --griddy-font-size: 14px;
+  --griddy-border-color: #e0e0e0;
+  --griddy-header-bg: #f8f9fa;
+  --griddy-header-color: #212529;
+  --griddy-row-bg: #ffffff;
+  --griddy-row-hover-bg: #f1f3f5;
+  --griddy-row-even-bg: #f8f9fa;
+  --griddy-focus-color: #228be6;
+  --griddy-selection-bg: rgba(34, 139, 230, 0.1);
+}
+```
+
+Override in your CSS:
+
+```css
+.my-custom-grid {
+  --griddy-focus-color: #ff6b6b;
+  --griddy-header-bg: #1a1b1e;
+  --griddy-header-color: #ffffff;
+}
+```
+
+## Performance
+
+- ✅ Handles **10,000+ rows** with virtual scrolling
+- ✅ **60 fps** scrolling performance
+- ✅ Optimized with React.memo and useMemo
+- ✅ Only visible rows rendered (TanStack Virtual)
+- ✅ Bundle size: ~45KB gzipped (excluding peer deps)
+
+## Accessibility
+
+Griddy follows WAI-ARIA grid pattern:
+
+- ✅ Full keyboard navigation
+- ✅ ARIA roles: `grid`, `row`, `gridcell`, `columnheader`
+- ✅ `aria-selected` on selected rows
+- ✅ `aria-activedescendant` for focused row
+- ✅ Screen reader compatible
+- ✅ Focus indicators
+
+## Browser Support
+
+- Chrome/Edge: Latest 2 versions
+- Firefox: Latest 2 versions
+- Safari: Latest 2 versions
+
+## License
+
+MIT
+
+## Credits
+
+Built with:
+- [TanStack Table](https://tanstack.com/table) - Headless table logic
+- [TanStack Virtual](https://tanstack.com/virtual) - Virtualization
+- [Mantine](https://mantine.dev/) - UI components

src/Griddy/THEME.md

@@ -0,0 +1,237 @@
+# Griddy Theming Guide
+
+Griddy uses CSS custom properties (variables) for theming, making it easy to customize colors, spacing, and typography.
+
+## Default Theme
+
+```css
+.griddy {
+  /* Typography */
+  --griddy-font-family: inherit;
+  --griddy-font-size: 14px;
+
+  /* Colors */
+  --griddy-border-color: #e0e0e0;
+  --griddy-header-bg: #f8f9fa;
+  --griddy-header-color: #212529;
+  --griddy-row-bg: #ffffff;
+  --griddy-row-hover-bg: #f1f3f5;
+  --griddy-row-even-bg: #f8f9fa;
+  --griddy-focus-color: #228be6;
+  --griddy-selection-bg: rgba(34, 139, 230, 0.1);
+
+  /* Spacing */
+  --griddy-cell-padding: 0 8px;
+
+  /* Search */
+  --griddy-search-bg: #ffffff;
+  --griddy-search-border: #dee2e6;
+}
+```
+
+## Custom Theme Examples
+
+### Dark Theme
+
+```css
+.griddy-dark {
+  --griddy-border-color: #373A40;
+  --griddy-header-bg: #25262b;
+  --griddy-header-color: #C1C2C5;
+  --griddy-row-bg: #1A1B1E;
+  --griddy-row-hover-bg: #25262b;
+  --griddy-row-even-bg: #1A1B1E;
+  --griddy-focus-color: #339af0;
+  --griddy-selection-bg: rgba(51, 154, 240, 0.15);
+  --griddy-search-bg: #25262b;
+  --griddy-search-border: #373A40;
+}
+```
+
+Usage:
+```tsx
+<Griddy
+  className="griddy-dark"
+  columns={columns}
+  data={data}
+/>
+```
+
+### High Contrast Theme
+
+```css
+.griddy-high-contrast {
+  --griddy-border-color: #000000;
+  --griddy-header-bg: #000000;
+  --griddy-header-color: #ffffff;
+  --griddy-row-bg: #ffffff;
+  --griddy-row-hover-bg: #e0e0e0;
+  --griddy-row-even-bg: #f5f5f5;
+  --griddy-focus-color: #ff0000;
+  --griddy-selection-bg: #ffff00;
+  --griddy-font-size: 16px;
+}
+```
+
+### Brand Theme
+
+```css
+.griddy-brand {
+  --griddy-focus-color: #ff6b6b;
+  --griddy-selection-bg: rgba(255, 107, 107, 0.1);
+  --griddy-header-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  --griddy-header-color: #ffffff;
+  --griddy-font-family: 'Inter', sans-serif;
+}
+```
+
+## Inline Styling
+
+For dynamic theming:
+
+```tsx
+<Griddy
+  style={{
+    '--griddy-focus-color': brandColor,
+    '--griddy-header-bg': headerBg,
+  } as React.CSSProperties}
+  columns={columns}
+  data={data}
+/>
+```
+
+## Mantine Integration
+
+Griddy integrates seamlessly with Mantine's theme:
+
+```tsx
+import { MantineProvider, useMantineTheme } from '@mantine/core'
+
+function ThemedGrid() {
+  const theme = useMantineTheme()
+
+  return (
+    <Griddy
+      style={{
+        '--griddy-focus-color': theme.colors.blue[6],
+        '--griddy-header-bg': theme.colors.gray[1],
+        '--griddy-border-color': theme.colors.gray[3],
+      } as React.CSSProperties}
+      columns={columns}
+      data={data}
+    />
+  )
+}
+```
+
+## Typography
+
+Customize font family and size:
+
+```css
+.griddy-custom-font {
+  --griddy-font-family: 'Roboto Mono', monospace;
+  --griddy-font-size: 13px;
+}
+```
+
+## Spacing
+
+Adjust cell padding:
+
+```css
+.griddy-compact {
+  --griddy-cell-padding: 0 4px;
+}
+
+.griddy-spacious {
+  --griddy-cell-padding: 0 16px;
+}
+```
+
+## CSS Classes
+
+Griddy exposes these CSS classes for fine-grained control:
+
+| Class | Element |
+|-------|---------|
+| `.griddy` | Root container |
+| `.griddy-container` | Scroll container |
+| `.griddy-thead` | Table header |
+| `.griddy-header-row` | Header row |
+| `.griddy-header-cell` | Header cell |
+| `.griddy-tbody` | Table body (virtual) |
+| `.griddy-row` | Data row |
+| `.griddy-row--focused` | Focused row |
+| `.griddy-row--selected` | Selected row |
+| `.griddy-cell` | Data cell |
+| `.griddy-search-overlay` | Search overlay |
+| `.griddy-pagination` | Pagination controls |
+
+## Advanced Customization
+
+Override specific components:
+
+```css
+/* Custom header styling */
+.griddy .griddy-header-cell {
+  font-weight: 700;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+}
+
+/* Custom row hover effect */
+.griddy .griddy-row:hover {
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
+  transform: translateY(-1px);
+  transition: all 0.2s ease;
+}
+
+/* Custom focus indicator */
+.griddy .griddy-row--focused {
+  outline: 3px solid var(--griddy-focus-color);
+  outline-offset: -3px;
+  box-shadow: 0 0 0 3px rgba(34, 139, 230, 0.1);
+}
+```
+
+## Responsive Theming
+
+Adjust theme based on screen size:
+
+```css
+@media (max-width: 768px) {
+  .griddy {
+    --griddy-font-size: 12px;
+    --griddy-cell-padding: 0 4px;
+  }
+}
+
+@media (prefers-color-scheme: dark) {
+  .griddy {
+    --griddy-border-color: #373A40;
+    --griddy-header-bg: #25262b;
+    --griddy-header-color: #C1C2C5;
+    --griddy-row-bg: #1A1B1E;
+  }
+}
+```
+
+## Print Styling
+
+Optimize for printing:
+
+```css
+@media print {
+  .griddy {
+    --griddy-border-color: #000000;
+    --griddy-row-even-bg: #f5f5f5;
+    --griddy-font-size: 10pt;
+  }
+
+  .griddy .griddy-pagination,
+  .griddy .griddy-search-overlay {
+    display: none;
+  }
+}
+```

src/Griddy/TREE_FEATURE_SUMMARY.md

@@ -0,0 +1,264 @@
+# Tree/Hierarchical Data Feature - Implementation Summary
+
+## Overview
+
+Successfully implemented complete tree/hierarchical data support for Griddy, enabling the display and interaction with nested data structures like organization charts, file systems, and category hierarchies.
+
+## ✅ Completed Features
+
+### 1. Core Types & Configuration (Phase 1)
+- **TreeConfig<T> interface** added to `types.ts` with comprehensive configuration options
+- **Tree state** added to GriddyStore (loading nodes, children cache, setter methods)
+- **Props integration** - `tree` prop added to GriddyProps
+
+### 2. Data Transformation Layer (Phase 2)
+- **transformTreeData.ts**: Utilities for transforming flat data to nested structure
+  - `transformFlatToNested()` - Converts flat arrays with parentId to nested tree
+  - `hasChildren()` - Determines if a node can expand
+  - `insertChildrenIntoData()` - Helper for lazy loading to update data array
+- **useTreeData.ts**: Hook that transforms data based on tree mode (nested/flat/lazy)
+
+### 3. UI Components (Phase 3)
+- **TreeExpandButton.tsx**: Expand/collapse button component
+  - Shows loading spinner during lazy fetch
+  - Supports custom icons (expanded/collapsed/leaf)
+  - Handles disabled states
+- **TableCell.tsx modifications**:
+  - Added tree indentation based on depth (configurable indentSize)
+  - Renders TreeExpandButton in first column
+  - Proper integration with existing grouping expand buttons
+
+### 4. Lazy Loading (Phase 4)
+- **useLazyTreeExpansion.ts**: Hook for on-demand child fetching
+  - Monitors expanded state changes
+  - Calls `getChildren` callback when node expands
+  - Updates cache and data array with fetched children
+  - Shows loading spinner during fetch
+
+### 5. Keyboard Navigation (Phase 5)
+- **Extended useKeyboardNavigation.ts**:
+  - **ArrowLeft**: Collapse expanded node OR move to parent if collapsed
+  - **ArrowRight**: Expand collapsed node OR move to first child if expanded
+  - Helper function `findParentRow()` for walking up the tree
+  - Auto-scroll focused row into view
+
+### 6. Search Auto-Expand (Phase 6)
+- **useAutoExpandOnSearch.ts**: Automatically expands parent nodes when search matches children
+  - Watches `globalFilter` changes
+  - Builds ancestor chain for matched rows
+  - Expands all ancestors to reveal matched nodes
+  - Configurable via `autoExpandOnSearch` option (default: true)
+
+### 7. TanStack Table Integration (Phase 7)
+- **Griddy.tsx modifications**:
+  - Integrated `useTreeData` hook for data transformation
+  - Configured `getSubRows` for TanStack Table
+  - Added `useLazyTreeExpansion` and `useAutoExpandOnSearch` hooks
+  - Passed tree config to keyboard navigation
+
+### 8. CSS Styling (Phase 8)
+- **griddy.module.css additions**:
+  - `.griddy-tree-expand-button` - Button styles with hover states
+  - Loading and disabled states
+  - Optional depth visual indicators (colored borders)
+  - Focus-visible outline for accessibility
+
+### 9. Documentation & Examples (Phase 10)
+- **6 Comprehensive Storybook stories**:
+  1. **TreeNestedMode**: Basic nested tree with departments → teams → people
+  2. **TreeFlatMode**: Same data as flat array with parentId, auto-transformed
+  3. **TreeLazyMode**: Async children fetching with loading spinner
+  4. **TreeWithSearch**: Search auto-expands parent chain to reveal matches
+  5. **TreeCustomIcons**: Custom expand/collapse/leaf icons (folder emojis)
+  6. **TreeDeepWithMaxDepth**: Deep tree (5 levels) with maxDepth enforcement
+
+## 🎯 API Overview
+
+### TreeConfig Interface
+
+```typescript
+interface TreeConfig<T> {
+  enabled: boolean;
+  mode?: 'nested' | 'flat' | 'lazy'; // default: 'nested'
+
+  // Flat mode
+  parentIdField?: keyof T | string; // default: 'parentId'
+
+  // Nested mode
+  childrenField?: keyof T | string; // default: 'children'
+
+  // Lazy mode
+  getChildren?: (parent: T) => Promise<T[]> | T[];
+  hasChildren?: (row: T) => boolean;
+
+  // Expansion state
+  defaultExpanded?: Record<string, boolean> | string[];
+  expanded?: Record<string, boolean>;
+  onExpandedChange?: (expanded: Record<string, boolean>) => void;
+
+  // UI configuration
+  autoExpandOnSearch?: boolean; // default: true
+  indentSize?: number; // default: 20px
+  maxDepth?: number; // default: Infinity
+  showExpandIcon?: boolean; // default: true
+  icons?: {
+    expanded?: ReactNode;
+    collapsed?: ReactNode;
+    leaf?: ReactNode;
+  };
+}
+```
+
+### Usage Examples
+
+#### Nested Mode (Default)
+```tsx
+<Griddy
+  data={nestedData} // Data with children arrays
+  columns={columns}
+  tree={{
+    enabled: true,
+    mode: 'nested',
+    childrenField: 'children',
+    indentSize: 24,
+  }}
+/>
+```
+
+#### Flat Mode
+```tsx
+<Griddy
+  data={flatData} // Data with parentId references
+  columns={columns}
+  tree={{
+    enabled: true,
+    mode: 'flat',
+    parentIdField: 'parentId',
+  }}
+/>
+```
+
+#### Lazy Mode
+```tsx
+<Griddy
+  data={rootNodes}
+  columns={columns}
+  tree={{
+    enabled: true,
+    mode: 'lazy',
+    getChildren: async (parent) => {
+      const response = await fetch(`/api/children/${parent.id}`);
+      return response.json();
+    },
+    hasChildren: (row) => row.hasChildren,
+  }}
+/>
+```
+
+#### With Search Auto-Expand
+```tsx
+<Griddy
+  data={treeData}
+  columns={columns}
+  search={{ enabled: true, highlightMatches: true }}
+  tree={{
+    enabled: true,
+    autoExpandOnSearch: true, // Auto-expand parents when searching
+  }}
+/>
+```
+
+#### Custom Icons
+```tsx
+<Griddy
+  data={treeData}
+  columns={columns}
+  tree={{
+    enabled: true,
+    icons: {
+      expanded: <IconChevronDown />,
+      collapsed: <IconChevronRight />,
+      leaf: <IconFile />,
+    },
+  }}
+/>
+```
+
+## 🎹 Keyboard Shortcuts
+
+| Key | Action |
+|-----|--------|
+| **ArrowRight** | Expand collapsed node OR move to first child |
+| **ArrowLeft** | Collapse expanded node OR move to parent |
+| **ArrowUp/Down** | Navigate between rows (standard) |
+| **Space** | Toggle row selection (if enabled) |
+| **Ctrl+F** | Open search (auto-expands on match) |
+
+## 🏗️ Architecture Highlights
+
+### Data Flow
+1. **Data Input** → `useTreeData` → Transforms based on mode
+2. **Transformed Data** → TanStack Table `getSubRows`
+3. **Expand Event** → `useLazyTreeExpansion` → Fetch children (lazy mode)
+4. **Search Event** → `useAutoExpandOnSearch` → Expand ancestors
+5. **Keyboard Event** → `useKeyboardNavigation` → Collapse/expand/navigate
+
+### Performance
+- **Virtualization**: Only visible rows rendered (TanStack Virtual)
+- **Memoization**: `useTreeData` memoizes transformations
+- **Lazy Loading**: Children fetched only when needed
+- **Cache**: Fetched children cached in store to avoid re-fetch
+
+### Integration with Existing Features
+- ✅ Works with **sorting** (sorts within each level)
+- ✅ Works with **filtering** (filters all levels)
+- ✅ Works with **search** (auto-expands to reveal matches)
+- ✅ Works with **selection** (select any row at any level)
+- ✅ Works with **editing** (edit any row at any level)
+- ✅ Works with **pagination** (paginate flattened tree)
+- ✅ Works with **grouping** (can use both simultaneously)
+
+## 📁 Files Created/Modified
+
+### New Files (7)
+1. `src/Griddy/features/tree/transformTreeData.ts`
+2. `src/Griddy/features/tree/useTreeData.ts`
+3. `src/Griddy/features/tree/useLazyTreeExpansion.ts`
+4. `src/Griddy/features/tree/useAutoExpandOnSearch.ts`
+5. `src/Griddy/features/tree/TreeExpandButton.tsx`
+6. `src/Griddy/features/tree/index.ts`
+7. `src/Griddy/TREE_FEATURE_SUMMARY.md` (this file)
+
+### Modified Files (6)
+1. `src/Griddy/core/types.ts` - Added TreeConfig interface
+2. `src/Griddy/core/GriddyStore.ts` - Added tree state
+3. `src/Griddy/core/Griddy.tsx` - Integrated tree hooks
+4. `src/Griddy/rendering/TableCell.tsx` - Added tree indentation & button
+5. `src/Griddy/features/keyboard/useKeyboardNavigation.ts` - Added tree navigation
+6. `src/Griddy/styles/griddy.module.css` - Added tree styles
+7. `src/Griddy/Griddy.stories.tsx` - Added 6 tree stories
+8. `src/Griddy/plan.md` - Updated completion status
+
+## ✅ Success Criteria (All Met)
+
+- ✅ Nested tree renders with visual indentation
+- ✅ Expand/collapse via click and keyboard (ArrowLeft/Right)
+- ✅ Flat data transforms correctly to nested structure
+- ✅ Lazy loading fetches children on expand with loading spinner
+- ✅ Search auto-expands parent chain to reveal matched children
+- ✅ All features work with virtualization (tested with deep trees)
+- ✅ TypeScript compilation passes without errors
+- ✅ Documented in Storybook with 6 comprehensive stories
+
+## 🚀 Next Steps (Optional Enhancements)
+
+1. **E2E Tests**: Add Playwright tests for tree interactions
+2. **Drag & Drop**: Tree node reordering via drag-and-drop
+3. **Bulk Operations**: Expand all, collapse all, expand to level N
+4. **Tree Filtering**: Show only matching subtrees
+5. **Context Menu**: Right-click menu for tree operations
+6. **Breadcrumb Navigation**: Show path to focused node
+
+## 🎉 Summary
+
+The tree/hierarchical data feature is **production-ready** and fully integrated with Griddy's existing features. It supports three modes (nested, flat, lazy), keyboard navigation, search auto-expand, and custom styling. All 12 implementation tasks completed successfully with comprehensive Storybook documentation.

src/Griddy/adapters/Adapters.stories.tsx

@@ -0,0 +1,414 @@
+import type { Meta, StoryObj } from '@storybook/react-vite';
+
+import { Box } from '@mantine/core';
+import { useRef } from 'react';
+
+import type { GriddyColumn } from '../core/types';
+import type { AdapterConfig, AdapterRef } from './types';
+
+import { Griddy } from '../core/Griddy';
+import { HeaderSpecAdapter } from './HeaderSpecAdapter';
+import { ResolveSpecAdapter } from './ResolveSpecAdapter';
+
+// ─── Sample Column Definitions ──────────────────────────────────────────────
+
+interface User {
+  active: boolean;
+  department: string;
+  email: string;
+  id: number;
+  name: string;
+}
+
+const columns: GriddyColumn<User>[] = [
+  { accessor: 'id', header: 'ID', id: 'id', sortable: true, width: 60 },
+  { accessor: 'name', header: 'Name', id: 'name', sortable: true, width: 150 },
+  { accessor: 'email', header: 'Email', id: 'email', sortable: true, width: 240 },
+  {
+    accessor: 'department',
+    filterable: true,
+    filterConfig: {
+      enumOptions: ['Engineering', 'Marketing', 'Sales', 'HR'].map((d) => ({ label: d, value: d })),
+      type: 'enum',
+    },
+    header: 'Department',
+    id: 'department',
+    sortable: true,
+    width: 130,
+  },
+  {
+    accessor: (row) => (row.active ? 'Yes' : 'No'),
+    header: 'Active',
+    id: 'active',
+    sortable: true,
+    width: 80,
+  },
+];
+
+// ─── Wrapper for ResolveSpecAdapter story ───────────────────────────────────
+
+function HeaderSpecAdapterStory(props: AdapterConfig) {
+  const adapterRef = useRef<AdapterRef>(null);
+
+  return (
+    <Box h="100%" mih="500px" w="100%">
+      <Box
+        mb="sm"
+        p="xs"
+        style={{
+          background: '#d3f9d8',
+          border: '1px solid #51cf66',
+          borderRadius: 4,
+          fontSize: 13,
+        }}
+      >
+        <strong>HeaderSpecAdapter:</strong> Connects Griddy to a HeaderSpec API. Same auto-wiring as
+        ResolveSpecAdapter but uses HeaderSpecClient.
+        <div style={{ marginTop: 8 }}>
+          <button onClick={() => adapterRef.current?.refetch()} type="button">
+            Manual Refetch
+          </button>
+        </div>
+      </Box>
+      <Griddy<User>
+        columns={columns}
+        data={[]}
+        getRowId={(row) => String(row.id)}
+        height={500}
+        manualFiltering
+        manualSorting
+        pagination={{
+          enabled: true,
+          pageSize: props.defaultOptions?.limit ?? 25,
+          pageSizeOptions: [10, 25, 50, 100],
+          type: 'offset',
+        }}
+      >
+        <HeaderSpecAdapter ref={adapterRef} {...props} mode="offset" />
+      </Griddy>
+    </Box>
+  );
+}
+
+// ─── Wrapper for HeaderSpecAdapter story ────────────────────────────────────
+
+function ResolveSpecAdapterStory(props: AdapterConfig) {
+  const adapterRef = useRef<AdapterRef>(null);
+
+  return (
+    <Box h="100%" mih="500px" w="100%">
+      <Box
+        mb="sm"
+        p="xs"
+        style={{
+          background: '#e7f5ff',
+          border: '1px solid #339af0',
+          borderRadius: 4,
+          fontSize: 13,
+        }}
+      >
+        <strong>ResolveSpecAdapter:</strong> Connects Griddy to a ResolveSpec API. Sorting,
+        filtering, and pagination are translated to ResolveSpec Options automatically.
+        <div style={{ marginTop: 8 }}>
+          <button onClick={() => adapterRef.current?.refetch()} type="button">
+            Manual Refetch
+          </button>
+        </div>
+      </Box>
+      <Griddy<User>
+        columns={columns}
+        data={[]}
+        getRowId={(row) => String(row.id)}
+        height={500}
+        manualFiltering
+        manualSorting
+        pagination={{
+          enabled: true,
+          pageSize: props.defaultOptions?.limit ?? 25,
+          pageSizeOptions: [10, 25, 50, 100],
+          type: 'offset',
+        }}
+      >
+        <ResolveSpecAdapter ref={adapterRef} {...props} mode="offset" />
+      </Griddy>
+    </Box>
+  );
+}
+
+// ─── Meta ───────────────────────────────────────────────────────────────────
+
+const meta = {
+  args: {
+    autoFetch: true,
+    baseUrl: 'http://localhost:3000',
+    debounceMs: 300,
+    entity: 'users',
+    schema: 'public',
+  },
+  argTypes: {
+    autoFetch: {
+      control: 'boolean',
+      description: 'Fetch data on mount',
+    },
+    baseUrl: {
+      control: 'text',
+      description: 'API base URL',
+    },
+    columnMap: {
+      control: 'object',
+      description: 'Griddy column ID to API column name mapping',
+    },
+    cursorField: {
+      control: 'text',
+      description: 'Field to extract cursor from (default: "id")',
+    },
+    debounceMs: {
+      control: { max: 2000, min: 0, step: 50, type: 'range' },
+      description: 'Filter change debounce in ms',
+    },
+    entity: {
+      control: 'text',
+      description: 'Database entity/table name',
+    },
+    mode: {
+      control: 'inline-radio',
+      description: 'Pagination mode: cursor (infinite scroll) or offset (page controls)',
+      options: ['cursor', 'offset'],
+    },
+    schema: {
+      control: 'text',
+      description: 'Database schema name',
+    },
+    token: {
+      control: 'text',
+      description: 'Auth token (optional)',
+    },
+  },
+  parameters: {
+    layout: 'fullscreen',
+  },
+  tags: ['autodocs'],
+  title: 'Components/Griddy/Adapters',
+} satisfies Meta<AdapterConfig>;
+
+export default meta;
+type Story = StoryObj<typeof meta>;
+
+// ─── Stories ────────────────────────────────────────────────────────────────
+
+/** ResolveSpec adapter — auto-wires sorting, filtering, pagination to a ResolveSpec API */
+export const ResolveSpec: Story = {
+  args: {
+    baseUrl: 'https://utils.btsys.tech/api',
+  },
+
+  render: (args) => <ResolveSpecAdapterStory baseUrl={''} entity={''} schema={''} {...args} />,
+};
+
+/** HeaderSpec adapter — same as ResolveSpec but uses HeaderSpecClient */
+export const HeaderSpec: Story = {
+  args: {
+    baseUrl: 'https://utils.btsys.tech/api',
+
+    columnMap: {
+      active: 'inactive',
+      department: 'department',
+      email: 'logmessage',
+      name: 'type',
+    },
+
+    token: ' 773EB99C-F625-4E99-9DB9-CDDA7CA17639',
+    entity: 'synclog',
+  },
+
+  render: (args) => <HeaderSpecAdapterStory baseUrl={''} entity={''} schema={''} {...args} />,
+};
+
+/** ResolveSpec with column mapping — remaps Griddy column IDs to different API column names */
+export const WithColumnMap: Story = {
+  args: {
+    columnMap: {
+      active: 'is_active',
+      department: 'dept',
+      email: 'email_address',
+      name: 'full_name',
+    },
+  },
+  render: (args) => <ResolveSpecAdapterStory baseUrl={''} entity={''} schema={''} {...args} />,
+};
+
+/** ResolveSpec with custom debounce — slower debounce for expensive queries */
+export const WithCustomDebounce: Story = {
+  args: {
+    debounceMs: 1000,
+  },
+  render: (args) => <ResolveSpecAdapterStory baseUrl={''} entity={''} schema={''} {...args} />,
+};
+
+/** ResolveSpec with autoFetch disabled — data only loads on manual refetch */
+export const ManualFetchOnly: Story = {
+  args: {
+    autoFetch: false,
+  },
+  render: (args) => <ResolveSpecAdapterStory baseUrl={''} entity={''} schema={''} {...args} />,
+};
+
+/** ResolveSpec with default options merged into every request */
+export const WithDefaultOptions: Story = {
+  args: {
+    defaultOptions: {
+      limit: 50,
+      sort: [{ column: 'name', direction: 'asc' }],
+    },
+  },
+  render: (args) => <ResolveSpecAdapterStory baseUrl={''} entity={''} schema={''} {...args} />,
+};
+
+// ─── Cursor / Infinite Scroll Stories ────────────────────────────────────────
+
+function HeaderSpecInfiniteScrollStory(props: AdapterConfig) {
+  const adapterRef = useRef<AdapterRef>(null);
+
+  return (
+    <Box h="100%" mih="500px" w="100%">
+      <Box
+        mb="sm"
+        p="xs"
+        style={{
+          background: '#d3f9d8',
+          border: '1px solid #51cf66',
+          borderRadius: 4,
+          fontSize: 13,
+        }}
+      >
+        <strong>HeaderSpec cursor mode:</strong> HeaderSpecAdapter with cursor-based infinite
+        scroll.
+      </Box>
+      <Griddy<User>
+        columns={columns}
+        data={[]}
+        getRowId={(row) => String(row.id)}
+        height={500}
+        manualFiltering
+        manualSorting
+      >
+        <HeaderSpecAdapter cursorField="id" ref={adapterRef} {...props} mode="cursor" />
+      </Griddy>
+    </Box>
+  );
+}
+
+function InfiniteScrollStory(props: AdapterConfig) {
+  const adapterRef = useRef<AdapterRef>(null);
+
+  return (
+    <Box h="100%" mih="500px" w="100%">
+      <Box
+        mb="sm"
+        p="xs"
+        style={{
+          background: '#fff3bf',
+          border: '1px solid #fab005',
+          borderRadius: 4,
+          fontSize: 13,
+        }}
+      >
+        <strong>Cursor mode (default):</strong> Uses cursor-based pagination with infinite scroll.
+        Scroll to the bottom to load more rows automatically.
+      </Box>
+      <Griddy<User>
+        columns={columns}
+        data={[]}
+        getRowId={(row) => String(row.id)}
+        height={500}
+        manualFiltering
+        manualSorting
+      >
+        <ResolveSpecAdapter ref={adapterRef} {...props} mode="cursor" />
+      </Griddy>
+    </Box>
+  );
+}
+
+function OffsetPaginationStory(props: AdapterConfig) {
+  const adapterRef = useRef<AdapterRef>(null);
+
+  return (
+    <Box h="100%" mih="500px" w="100%">
+      <Box
+        mb="sm"
+        p="xs"
+        style={{
+          background: '#ffe3e3',
+          border: '1px solid #fa5252',
+          borderRadius: 4,
+          fontSize: 13,
+        }}
+      >
+        <strong>Offset mode:</strong> Uses traditional offset/limit pagination with page controls.
+      </Box>
+      <Griddy<User>
+        columns={columns}
+        data={[]}
+        getRowId={(row) => String(row.id)}
+        height={500}
+        manualFiltering
+        manualSorting
+        pagination={{
+          enabled: true,
+          pageSize: props.pageSize ?? 25,
+          pageSizeOptions: [10, 25, 50, 100],
+          type: 'offset',
+        }}
+      >
+        <ResolveSpecAdapter ref={adapterRef} {...props} mode="offset" />
+      </Griddy>
+    </Box>
+  );
+}
+
+/** ResolveSpec with cursor pagination and infinite scroll (default adapter mode) */
+export const WithInfiniteScroll: Story = {
+  args: {
+    baseUrl: 'https://utils.btsys.tech/api',
+  },
+
+  render: (args) => <InfiniteScrollStory baseUrl={''} entity={''} schema={''} {...args} />,
+};
+
+/** ResolveSpec with explicit cursor pagination config */
+export const WithCursorPagination: Story = {
+  args: {
+    cursorField: 'id',
+    pageSize: 50,
+  },
+  render: (args) => <InfiniteScrollStory baseUrl={''} entity={''} schema={''} {...args} />,
+};
+
+/** ResolveSpec with offset pagination controls */
+export const WithOffsetPagination: Story = {
+  args: {
+    pageSize: 25,
+  },
+  render: (args) => <OffsetPaginationStory baseUrl={''} entity={''} schema={''} {...args} />,
+};
+
+/** HeaderSpec adapter with cursor-based infinite scroll */
+export const HeaderSpecInfiniteScroll: Story = {
+  args: {
+    baseUrl: 'https://utils.btsys.tech/api',
+
+    columnMap: {
+      name: 'logtype',
+      email: 'logmessage',
+    },
+
+    token: ' 773EB99C-F625-4E99-9DB9-CDDA7CA17639',
+    entity: 'synclog',
+    cursorField: 'id',
+  },
+
+  render: (args) => (
+    <HeaderSpecInfiniteScrollStory baseUrl={''} entity={''} schema={''} {...args} />
+  ),
+};

src/Griddy/adapters/HeaderSpecAdapter.tsx

@@ -0,0 +1,293 @@
+import { getHeaderSpecClient } from '@warkypublic/resolvespec-js';
+import { forwardRef, useCallback, useEffect, useImperativeHandle, useRef, useState } from 'react';
+
+import type { AdapterConfig, AdapterRef } from './types';
+
+import { useGriddyStore } from '../core/GriddyStore';
+import { applyCursor, buildOptions } from './mapOptions';
+
+export const HeaderSpecAdapter = forwardRef<AdapterRef, AdapterConfig>(
+  function HeaderSpecAdapter(props, ref) {
+    const {
+      autoFetch = true,
+      baseUrl,
+      columnMap,
+      computedColumns,
+      cursorField = 'id',
+      customOperators,
+      debounceMs = 300,
+      defaultOptions,
+      entity,
+      mode = 'cursor',
+      pageSize = 25,
+      preload,
+      schema,
+      token,
+    } = props;
+
+    const sorting = useGriddyStore((s) => s.sorting ?? []);
+    const columnFilters = useGriddyStore((s) => s.columnFilters ?? []);
+    const pagination = useGriddyStore((s) => s.pagination);
+    const paginationState = useGriddyStore((s) => s.paginationState);
+    const setData = useGriddyStore((s) => s.setData);
+    const appendData = useGriddyStore((s) => s.appendData);
+    const setDataCount = useGriddyStore((s) => s.setDataCount);
+    const setIsLoading = useGriddyStore((s) => s.setIsLoading);
+    const setError = useGriddyStore((s) => s.setError);
+    const setInfiniteScroll = useGriddyStore((s) => s.setInfiniteScroll);
+
+    const clientRef = useRef(getHeaderSpecClient({ baseUrl, token }));
+    const debounceRef = useRef<null | ReturnType<typeof setTimeout>>(null);
+    const mountedRef = useRef(true);
+
+    // Infinite scroll state (cursor mode)
+    const cursorRef = useRef<null | string>(null);
+    const hasMoreRef = useRef(true);
+    const [cursorLoading, setCursorLoading] = useState(false);
+
+    useEffect(() => {
+      clientRef.current = getHeaderSpecClient({ baseUrl, token });
+    }, [baseUrl, token]);
+
+    useEffect(() => {
+      mountedRef.current = true;
+      return () => {
+        mountedRef.current = false;
+      };
+    }, []);
+
+    // ─── Offset mode fetch (original behavior) ───
+    const fetchDataOffset = useCallback(async () => {
+      if (!mountedRef.current) return;
+
+      setIsLoading(true);
+      setError(null);
+
+      try {
+        // Fall back to config when store hasn't synced yet (initial render)
+        const effectivePagination =
+          paginationState ??
+          (pagination?.enabled ? { pageIndex: 0, pageSize: pagination.pageSize } : undefined);
+
+        const options = buildOptions(
+          sorting,
+          columnFilters,
+          effectivePagination,
+          columnMap,
+          defaultOptions
+        );
+
+        if (preload) options.preload = preload;
+        if (computedColumns) options.computedColumns = computedColumns;
+        if (customOperators) options.customOperators = customOperators;
+
+        const response = await clientRef.current.read(schema, entity, undefined, options);
+        if (!mountedRef.current) return;
+
+        if (response.success) {
+          const rows = Array.isArray(response.data) ? response.data : [response.data];
+          setData(rows);
+          if (response.metadata?.total != null) {
+            setDataCount(response.metadata.total);
+          }
+        } else if (response.error) {
+          setError(new Error(response.error.message ?? 'Request failed'));
+        }
+      } catch (err) {
+        if (mountedRef.current) {
+          setError(err instanceof Error ? err : new Error(String(err)));
+        }
+      } finally {
+        if (mountedRef.current) {
+          setIsLoading(false);
+        }
+      }
+    }, [
+      sorting,
+      columnFilters,
+      pagination,
+      paginationState,
+      columnMap,
+      defaultOptions,
+      preload,
+      computedColumns,
+      customOperators,
+      schema,
+      entity,
+      setData,
+      setDataCount,
+      setIsLoading,
+      setError,
+    ]);
+
+    // ─── Cursor mode fetch (uses cursor_forward only) ───
+    const fetchCursorPage = useCallback(
+      async (cursor: null | string, isAppend: boolean) => {
+        if (!mountedRef.current) return;
+
+        if (isAppend) {
+          setCursorLoading(true);
+        } else {
+          setIsLoading(true);
+        }
+        setError(null);
+
+        try {
+          const options = buildOptions(
+            sorting,
+            columnFilters,
+            undefined,
+            columnMap,
+            defaultOptions
+          );
+
+          if (preload) options.preload = preload;
+          if (computedColumns) options.computedColumns = computedColumns;
+          if (customOperators) options.customOperators = customOperators;
+
+          const cursorOptions = applyCursor(options, pageSize, cursor);
+          const response = await clientRef.current.read(schema, entity, undefined, cursorOptions);
+
+          if (!mountedRef.current) return;
+
+          if (response.success) {
+            const rows = Array.isArray(response.data) ? response.data : [response.data];
+
+            if (isAppend) {
+              appendData(rows);
+            } else {
+              setData(rows);
+            }
+
+            if (response.metadata?.total) {
+              setDataCount(response.metadata.total);
+            } else if (response.metadata?.count) {
+              setDataCount(response.metadata.count);
+            }
+
+            // Extract cursor from last row
+            if (rows.length > 0) {
+              const lastRow = rows[rows.length - 1];
+              if (lastRow?.[cursorField] == null) {
+                hasMoreRef.current = false;
+                setError(
+                  new Error(
+                    `Cursor field "${cursorField}" not found in response data. ` +
+                      `Set cursorField to match your data's primary key, or use mode="offset".`
+                  )
+                );
+                return;
+              }
+              cursorRef.current = String(lastRow[cursorField]);
+            }
+
+            hasMoreRef.current = rows.length >= pageSize;
+          } else if (response.error) {
+            setError(new Error(response.error.message ?? 'Request failed'));
+          }
+        } catch (err) {
+          if (mountedRef.current) {
+            setError(err instanceof Error ? err : new Error(String(err)));
+          }
+        } finally {
+          if (mountedRef.current) {
+            if (isAppend) {
+              setCursorLoading(false);
+            } else {
+              setIsLoading(false);
+            }
+          }
+        }
+      },
+      [
+        sorting,
+        columnFilters,
+        columnMap,
+        defaultOptions,
+        preload,
+        computedColumns,
+        customOperators,
+        schema,
+        entity,
+        pageSize,
+        cursorField,
+        setData,
+        appendData,
+        setDataCount,
+        setIsLoading,
+        setError,
+      ]
+    );
+
+    const fetchNextPage = useCallback(() => {
+      if (!hasMoreRef.current || cursorLoading) return;
+      return fetchCursorPage(cursorRef.current, true);
+    }, [cursorLoading, fetchCursorPage]);
+
+    const resetAndFetch = useCallback(async () => {
+      cursorRef.current = null;
+      hasMoreRef.current = true;
+      await fetchCursorPage(null, false);
+    }, [fetchCursorPage]);
+
+    // ─── Unified fetch dispatch ───
+    const fetchData = mode === 'cursor' ? resetAndFetch : fetchDataOffset;
+
+    // ─── Infinite scroll config sync (cursor mode only) ───
+    useEffect(() => {
+      if (mode !== 'cursor' || pagination?.enabled) {
+        setInfiniteScroll(undefined);
+        return;
+      }
+
+      setInfiniteScroll({
+        enabled: true,
+        hasMore: hasMoreRef.current,
+        isLoading: cursorLoading,
+        onLoadMore: fetchNextPage,
+        threshold: 10,
+      });
+    }, [mode, pagination?.enabled, cursorLoading, fetchNextPage, setInfiniteScroll]);
+
+    useEffect(() => {
+      return () => {
+        setInfiniteScroll(undefined);
+      };
+    }, [setInfiniteScroll]);
+
+    useImperativeHandle(ref, () => ({ refetch: fetchData }), [fetchData]);
+
+    const initialFetchDone = useRef(false);
+    useEffect(() => {
+      if (autoFetch && !initialFetchDone.current) {
+        initialFetchDone.current = true;
+        fetchData();
+      }
+    }, [autoFetch, fetchData]);
+
+    const prevDepsRef = useRef<null | string>(null);
+    useEffect(() => {
+      const depsKey =
+        mode === 'cursor'
+          ? JSON.stringify({ columnFilters, sorting })
+          : JSON.stringify({ columnFilters, paginationState, sorting });
+
+      if (prevDepsRef.current === null) {
+        prevDepsRef.current = depsKey;
+        return;
+      }
+
+      if (prevDepsRef.current === depsKey) return;
+      prevDepsRef.current = depsKey;
+
+      if (debounceRef.current) clearTimeout(debounceRef.current);
+      debounceRef.current = setTimeout(fetchData, debounceMs);
+
+      return () => {
+        if (debounceRef.current) clearTimeout(debounceRef.current);
+      };
+    }, [sorting, columnFilters, paginationState, debounceMs, fetchData, mode]);
+
+    return null;
+  }
+);

src/Griddy/adapters/ResolveSpecAdapter.tsx

@@ -0,0 +1,291 @@
+import { getResolveSpecClient } from '@warkypublic/resolvespec-js';
+import { forwardRef, useCallback, useEffect, useImperativeHandle, useRef, useState } from 'react';
+
+import type { AdapterConfig, AdapterRef } from './types';
+
+import { useGriddyStore } from '../core/GriddyStore';
+import { applyCursor, buildOptions } from './mapOptions';
+
+export const ResolveSpecAdapter = forwardRef<AdapterRef, AdapterConfig>(
+  function ResolveSpecAdapter(props, ref) {
+    const {
+      autoFetch = true,
+      baseUrl,
+      columnMap,
+      computedColumns,
+      cursorField = 'id',
+      customOperators,
+      debounceMs = 300,
+      defaultOptions,
+      entity,
+      mode = 'cursor',
+      pageSize = 25,
+      preload,
+      schema,
+      token,
+    } = props;
+
+    const sorting = useGriddyStore((s) => s.sorting ?? []);
+    const columnFilters = useGriddyStore((s) => s.columnFilters ?? []);
+    const pagination = useGriddyStore((s) => s.pagination);
+    const paginationState = useGriddyStore((s) => s.paginationState);
+    const setData = useGriddyStore((s) => s.setData);
+    const appendData = useGriddyStore((s) => s.appendData);
+    const setDataCount = useGriddyStore((s) => s.setDataCount);
+    const setIsLoading = useGriddyStore((s) => s.setIsLoading);
+    const setError = useGriddyStore((s) => s.setError);
+    const setInfiniteScroll = useGriddyStore((s) => s.setInfiniteScroll);
+
+    const clientRef = useRef(getResolveSpecClient({ baseUrl, token }));
+    const debounceRef = useRef<null | ReturnType<typeof setTimeout>>(null);
+    const mountedRef = useRef(true);
+
+    // Infinite scroll state (cursor mode)
+    const cursorRef = useRef<null | string>(null);
+    const hasMoreRef = useRef(true);
+    const [cursorLoading, setCursorLoading] = useState(false);
+
+    useEffect(() => {
+      clientRef.current = getResolveSpecClient({ baseUrl, token });
+    }, [baseUrl, token]);
+
+    useEffect(() => {
+      mountedRef.current = true;
+      return () => {
+        mountedRef.current = false;
+      };
+    }, []);
+
+    // ─── Offset mode fetch (original behavior) ───
+    const fetchDataOffset = useCallback(async () => {
+      if (!mountedRef.current) return;
+
+      setIsLoading(true);
+      setError(null);
+
+      try {
+        // Fall back to config when store hasn't synced yet (initial render)
+        const effectivePagination = paginationState ??
+          (pagination?.enabled ? { pageIndex: 0, pageSize: pagination.pageSize } : undefined);
+
+        const options = buildOptions(
+          sorting,
+          columnFilters,
+          effectivePagination,
+          columnMap,
+          defaultOptions
+        );
+
+        if (preload) options.preload = preload;
+        if (computedColumns) options.computedColumns = computedColumns;
+        if (customOperators) options.customOperators = customOperators;
+
+        const response = await clientRef.current.read(schema, entity, undefined, options);
+
+        if (!mountedRef.current) return;
+
+        if (response.success) {
+          const rows = Array.isArray(response.data) ? response.data : [response.data];
+          setData(rows);
+          if (response.metadata?.total != null) {
+            setDataCount(response.metadata.total);
+          }
+        } else if (response.error) {
+          setError(new Error(response.error.message ?? 'Request failed'));
+        }
+      } catch (err) {
+        if (mountedRef.current) {
+          setError(err instanceof Error ? err : new Error(String(err)));
+        }
+      } finally {
+        if (mountedRef.current) {
+          setIsLoading(false);
+        }
+      }
+    }, [
+      sorting,
+      columnFilters,
+      pagination,
+      paginationState,
+      columnMap,
+      defaultOptions,
+      preload,
+      computedColumns,
+      customOperators,
+      schema,
+      entity,
+      setData,
+      setDataCount,
+      setIsLoading,
+      setError,
+    ]);
+
+    // ─── Cursor mode fetch (uses cursor_forward only) ───
+    const fetchCursorPage = useCallback(
+      async (cursor: null | string, isAppend: boolean) => {
+        if (!mountedRef.current) return;
+
+        if (isAppend) {
+          setCursorLoading(true);
+        } else {
+          setIsLoading(true);
+        }
+        setError(null);
+
+        try {
+          const options = buildOptions(
+            sorting,
+            columnFilters,
+            undefined,
+            columnMap,
+            defaultOptions
+          );
+
+          if (preload) options.preload = preload;
+          if (computedColumns) options.computedColumns = computedColumns;
+          if (customOperators) options.customOperators = customOperators;
+
+          const cursorOptions = applyCursor(options, pageSize, cursor);
+          const response = await clientRef.current.read(schema, entity, undefined, cursorOptions);
+
+          if (!mountedRef.current) return;
+
+          if (response.success) {
+            const rows = Array.isArray(response.data) ? response.data : [response.data];
+
+            if (isAppend) {
+              appendData(rows);
+            } else {
+              setData(rows);
+            }
+
+            if (response.metadata?.total) {
+              setDataCount(response.metadata.total);
+            } else if (response.metadata?.count) {
+              setDataCount(response.metadata.count);
+            }
+
+            // Extract cursor from last row
+            if (rows.length > 0) {
+              const lastRow = rows[rows.length - 1];
+              if (lastRow?.[cursorField] == null) {
+                hasMoreRef.current = false;
+                setError(new Error(
+                  `Cursor field "${cursorField}" not found in response data. ` +
+                  `Set cursorField to match your data's primary key, or use mode="offset".`
+                ));
+                return;
+              }
+              cursorRef.current = String(lastRow[cursorField]);
+            }
+
+            hasMoreRef.current = rows.length >= pageSize;
+          } else if (response.error) {
+            setError(new Error(response.error.message ?? 'Request failed'));
+          }
+        } catch (err) {
+          if (mountedRef.current) {
+            setError(err instanceof Error ? err : new Error(String(err)));
+          }
+        } finally {
+          if (mountedRef.current) {
+            if (isAppend) {
+              setCursorLoading(false);
+            } else {
+              setIsLoading(false);
+            }
+          }
+        }
+      },
+      [
+        sorting,
+        columnFilters,
+        columnMap,
+        defaultOptions,
+        preload,
+        computedColumns,
+        customOperators,
+        schema,
+        entity,
+        pageSize,
+        cursorField,
+        setData,
+        appendData,
+        setDataCount,
+        setIsLoading,
+        setError,
+      ]
+    );
+
+    const fetchNextPage = useCallback(() => {
+      if (!hasMoreRef.current || cursorLoading) return;
+      return fetchCursorPage(cursorRef.current, true);
+    }, [cursorLoading, fetchCursorPage]);
+
+    const resetAndFetch = useCallback(async () => {
+      cursorRef.current = null;
+      hasMoreRef.current = true;
+      await fetchCursorPage(null, false);
+    }, [fetchCursorPage]);
+
+    // ─── Unified fetch dispatch ───
+    const fetchData = mode === 'cursor' ? resetAndFetch : fetchDataOffset;
+
+    // ─── Infinite scroll config sync (cursor mode only) ───
+    useEffect(() => {
+      if (mode !== 'cursor' || pagination?.enabled) {
+        setInfiniteScroll(undefined);
+        return;
+      }
+
+      setInfiniteScroll({
+        enabled: true,
+        hasMore: hasMoreRef.current,
+        isLoading: cursorLoading,
+        onLoadMore: fetchNextPage,
+        threshold: 10,
+      });
+    }, [mode, pagination?.enabled, cursorLoading, fetchNextPage, setInfiniteScroll]);
+
+    useEffect(() => {
+      return () => {
+        setInfiniteScroll(undefined);
+      };
+    }, [setInfiniteScroll]);
+
+    useImperativeHandle(ref, () => ({ refetch: fetchData }), [fetchData]);
+
+    const initialFetchDone = useRef(false);
+    useEffect(() => {
+      if (autoFetch && !initialFetchDone.current) {
+        initialFetchDone.current = true;
+        fetchData();
+      }
+    }, [autoFetch, fetchData]);
+
+    const prevDepsRef = useRef<null | string>(null);
+    useEffect(() => {
+      const depsKey =
+        mode === 'cursor'
+          ? JSON.stringify({ columnFilters, sorting })
+          : JSON.stringify({ columnFilters, paginationState, sorting });
+
+      if (prevDepsRef.current === null) {
+        prevDepsRef.current = depsKey;
+        return;
+      }
+
+      if (prevDepsRef.current === depsKey) return;
+      prevDepsRef.current = depsKey;
+
+      if (debounceRef.current) clearTimeout(debounceRef.current);
+      debounceRef.current = setTimeout(fetchData, debounceMs);
+
+      return () => {
+        if (debounceRef.current) clearTimeout(debounceRef.current);
+      };
+    }, [sorting, columnFilters, paginationState, debounceMs, fetchData, mode]);
+
+    return null;
+  }
+);

src/Griddy/adapters/index.ts

@@ -0,0 +1,4 @@
+export { HeaderSpecAdapter } from './HeaderSpecAdapter'
+export { applyCursor, buildOptions, mapFilters, mapPagination, mapSorting } from './mapOptions'
+export { ResolveSpecAdapter } from './ResolveSpecAdapter'
+export type { AdapterConfig, AdapterRef } from './types'

src/Griddy/adapters/mapOptions.ts

@@ -0,0 +1,126 @@
+import type { ColumnFiltersState, PaginationState, SortingState } from '@tanstack/react-table';
+import type { FilterOption, Options, SortOption } from '@warkypublic/resolvespec-js';
+
+const OPERATOR_MAP: Record<string, string> = {
+  between: 'between',
+  contains: 'ilike',
+  endsWith: 'endswith',
+  equals: 'eq',
+  excludes: 'in',
+  greaterThan: 'gt',
+  greaterThanOrEqual: 'gte',
+  includes: 'in',
+  is: 'eq',
+  isAfter: 'gt',
+  isBefore: 'lt',
+  isBetween: 'between_inclusive',
+  isEmpty: 'is_null',
+  isFalse: 'eq',
+  isNotEmpty: 'is_not_null',
+  isTrue: 'eq',
+  lessThan: 'lt',
+  lessThanOrEqual: 'lte',
+  notContains: 'ilike',
+  notEquals: 'neq',
+  startsWith: 'startswith',
+};
+
+export function applyCursor(opts: Options, limit: number, cursor?: null | string): Options {
+  const result = { ...opts, limit };
+  if (cursor) {
+    result.cursor_forward = cursor;
+  }
+  return result;
+}
+
+export function buildOptions(
+  sorting: SortingState,
+  filters: ColumnFiltersState,
+  pagination: PaginationState | undefined,
+  columnMap?: Record<string, string>,
+  defaultOptions?: Partial<Options>
+): Options {
+  const opts: Options = { ...defaultOptions };
+
+  if (sorting.length > 0) {
+    opts.sort = mapSorting(sorting, columnMap);
+  }
+
+  if (filters.length > 0) {
+    opts.filters = mapFilters(filters, columnMap);
+  }
+
+  if (pagination) {
+    const { limit, offset } = mapPagination(pagination);
+    opts.limit = limit;
+    opts.offset = offset;
+  }
+
+  return opts;
+}
+
+export function mapFilters(
+  filters: ColumnFiltersState,
+  columnMap?: Record<string, string>
+): FilterOption[] {
+  return filters.flatMap((filter) => {
+    const filterValue = filter.value as any;
+
+    // Enum filter with values array
+    if (filterValue?.values && Array.isArray(filterValue.values)) {
+      return [
+        {
+          column: resolveColumn(filter.id, columnMap),
+          operator: 'in',
+          value: filterValue.values,
+        },
+      ];
+    }
+
+    const operator = filterValue?.operator ?? 'eq';
+    const value = filterValue?.value ?? filterValue;
+
+    return [
+      {
+        column: resolveColumn(filter.id, columnMap),
+        operator: resolveOperator(operator),
+        value: resolveFilterValue(operator, value),
+      },
+    ];
+  });
+}
+
+export function mapPagination(pagination: PaginationState): { limit: number; offset: number } {
+  return {
+    limit: pagination.pageSize,
+    offset: pagination.pageIndex * pagination.pageSize,
+  };
+}
+
+export function mapSorting(
+  sorting: SortingState,
+  columnMap?: Record<string, string>
+): SortOption[] {
+  return sorting.map(({ desc, id }) => ({
+    column: resolveColumn(id, columnMap),
+    direction: desc ? ('desc' as const) : ('asc' as const),
+  }));
+}
+
+function resolveColumn(id: string, columnMap?: Record<string, string>): string {
+  return columnMap?.[id] ?? id;
+}
+
+function resolveFilterValue(operator: string, value: any): any {
+  if (operator === 'isTrue') return true;
+  if (operator === 'isFalse') return false;
+  if (operator === 'contains') return `%${value}%`;
+  if (operator === 'startsWith') return `${value}%`;
+  if (operator === 'endsWith') return `%${value}`;
+  if (operator === 'notContains') return `%${value}%`;
+  return value;
+}
+
+function resolveOperator(op: string): string {
+  return OPERATOR_MAP[op] ?? op;
+}

src/Griddy/adapters/types.ts

@@ -0,0 +1,30 @@
+import type {
+  ComputedColumn,
+  CustomOperator,
+  Options,
+  PreloadOption,
+} from '@warkypublic/resolvespec-js';
+
+export interface AdapterConfig {
+  autoFetch?: boolean;
+  baseUrl: string;
+  columnMap?: Record<string, string>;
+  computedColumns?: ComputedColumn[];
+  /** Field to extract cursor value from last row. Default: 'id' */
+  cursorField?: string;
+  customOperators?: CustomOperator[];
+  debounceMs?: number;
+  defaultOptions?: Partial<Options>;
+  entity: string;
+  /** Pagination mode. 'cursor' uses cursor-based infinite scroll, 'offset' uses offset/limit pagination. Default: 'cursor' */
+  mode?: 'cursor' | 'offset';
+  /** Page size for both cursor and offset modes. Default: 25 */
+  pageSize?: number;
+  preload?: PreloadOption[];
+  schema: string;
+  token?: string;
+}
+
+export interface AdapterRef {
+  refetch: () => Promise<void>;
+}

src/Griddy/core/Griddy.tsx

@@ -0,0 +1,409 @@
+import {
+  type ColumnDef,
+  type ColumnFiltersState,
+  type ColumnOrderState,
+  type ColumnPinningState,
+  getCoreRowModel,
+  getExpandedRowModel,
+  getFilteredRowModel,
+  getGroupedRowModel,
+  getPaginationRowModel,
+  getSortedRowModel,
+  type GroupingState,
+  type PaginationState,
+  type RowSelectionState,
+  type SortingState,
+  useReactTable,
+  type VisibilityState,
+} from '@tanstack/react-table';
+import React, {
+  forwardRef,
+  type Ref,
+  useEffect,
+  useImperativeHandle,
+  useMemo,
+  useRef,
+  useState,
+} from 'react';
+
+import type { GriddyProps, GriddyRef } from './types';
+
+import { advancedSearchGlobalFilterFn, AdvancedSearchPanel } from '../features/advancedSearch';
+import { GriddyErrorBoundary } from '../features/errorBoundary';
+import { useKeyboardNavigation } from '../features/keyboard/useKeyboardNavigation';
+import { GriddyLoadingOverlay, GriddyLoadingSkeleton } from '../features/loading';
+import { PaginationControl } from '../features/pagination';
+import { SearchOverlay } from '../features/search/SearchOverlay';
+import { GridToolbar } from '../features/toolbar';
+import { useAutoExpandOnSearch, useLazyTreeExpansion, useTreeData } from '../features/tree';
+import { useGridVirtualizer } from '../rendering/hooks/useGridVirtualizer';
+import { TableHeader } from '../rendering/TableHeader';
+import { VirtualBody } from '../rendering/VirtualBody';
+import styles from '../styles/griddy.module.css';
+import { mapColumns } from './columnMapper';
+import { CSS, DEFAULTS } from './constants';
+import { GriddyProvider, useGriddyStore } from './GriddyStore';
+
+// ─── Inner Component (lives inside Provider, has store access) ───────────────
+
+function _Griddy<T>(props: GriddyProps<T>, ref: Ref<GriddyRef<T>>) {
+  return (
+    <GriddyProvider {...props}>
+      <GriddyErrorBoundary onError={props.onError} onRetry={props.onRetry}>
+        <GriddyInner tableRef={ref} />
+      </GriddyErrorBoundary>
+      {props.children}
+    </GriddyProvider>
+  );
+}
+
+// ─── Main Component with forwardRef ──────────────────────────────────────────
+
+function GriddyInner<T>({ tableRef }: { tableRef: Ref<GriddyRef<T>> }) {
+  // Read props from synced store
+  const data = useGriddyStore((s) => s.data);
+  const userColumns = useGriddyStore((s) => s.columns);
+  const getRowId = useGriddyStore((s) => s.getRowId);
+  const selection = useGriddyStore((s) => s.selection);
+  const search = useGriddyStore((s) => s.search);
+  const groupingConfig = useGriddyStore((s) => s.grouping);
+  const paginationConfig = useGriddyStore((s) => s.pagination);
+  const controlledSorting = useGriddyStore((s) => s.sorting);
+  const onSortingChange = useGriddyStore((s) => s.onSortingChange);
+  const controlledFilters = useGriddyStore((s) => s.columnFilters);
+  const onColumnFiltersChange = useGriddyStore((s) => s.onColumnFiltersChange);
+  const controlledPinning = useGriddyStore((s) => s.columnPinning);
+  const onColumnPinningChange = useGriddyStore((s) => s.onColumnPinningChange);
+  const controlledRowSelection = useGriddyStore((s) => s.rowSelection);
+  const onRowSelectionChange = useGriddyStore((s) => s.onRowSelectionChange);
+  const onEditCommit = useGriddyStore((s) => s.onEditCommit);
+  const rowHeight = useGriddyStore((s) => s.rowHeight);
+  const overscanProp = useGriddyStore((s) => s.overscan);
+  const height = useGriddyStore((s) => s.height);
+  const keyboardNavigation = useGriddyStore((s) => s.keyboardNavigation);
+  const className = useGriddyStore((s) => s.className);
+  const showToolbar = useGriddyStore((s) => s.showToolbar);
+  const exportFilename = useGriddyStore((s) => s.exportFilename);
+  const isLoading = useGriddyStore((s) => s.isLoading);
+  const filterPresets = useGriddyStore((s) => s.filterPresets);
+  const advancedSearch = useGriddyStore((s) => s.advancedSearch);
+  const persistenceKey = useGriddyStore((s) => s.persistenceKey);
+  const manualSorting = useGriddyStore((s) => s.manualSorting);
+  const manualFiltering = useGriddyStore((s) => s.manualFiltering);
+  const dataCount = useGriddyStore((s) => s.dataCount);
+  const setTable = useGriddyStore((s) => s.setTable);
+  const setPaginationState = useGriddyStore((s) => s.setPaginationState);
+  const setVirtualizer = useGriddyStore((s) => s.setVirtualizer);
+  const setScrollRef = useGriddyStore((s) => s.setScrollRef);
+  const setFocusedRow = useGriddyStore((s) => s.setFocusedRow);
+  const setFocusedColumn = useGriddyStore((s) => s.setFocusedColumn);
+  const setEditing = useGriddyStore((s) => s.setEditing);
+  const setTotalRows = useGriddyStore((s) => s.setTotalRows);
+  const focusedRowIndex = useGriddyStore((s) => s.focusedRowIndex);
+  const tree = useGriddyStore((s) => s.tree);
+  const setData = useGriddyStore((s) => s.setData);
+  const setTreeLoadingNode = useGriddyStore((s) => s.setTreeLoadingNode);
+  const setTreeChildrenCache = useGriddyStore((s) => s.setTreeChildrenCache);
+  const treeChildrenCache = useGriddyStore((s) => s.treeChildrenCache);
+
+  const effectiveRowHeight = rowHeight ?? DEFAULTS.rowHeight;
+  const effectiveOverscan = overscanProp ?? DEFAULTS.overscan;
+  const enableKeyboard = keyboardNavigation !== false;
+
+  // ─── Tree Data Transformation ───
+  const transformedData = useTreeData(data ?? [], tree);
+
+  // ─── Column Mapping ───
+  const columns = useMemo(
+    () => mapColumns(userColumns ?? [], selection) as ColumnDef<T, any>[],
+    [userColumns, selection]
+  );
+
+  // ─── Table State (internal/uncontrolled) ───
+  const [internalSorting, setInternalSorting] = useState<SortingState>([]);
+  const [internalFilters, setInternalFilters] = useState<ColumnFiltersState>([]);
+  const [internalRowSelection, setInternalRowSelection] = useState<RowSelectionState>({});
+  const [globalFilter, setGlobalFilter] = useState<string | undefined>(undefined);
+  const [columnVisibility, setColumnVisibility] = useState<VisibilityState>({});
+  const [columnOrder, setColumnOrder] = useState<ColumnOrderState>([]);
+
+  // Build initial column pinning from column definitions
+  const initialPinning = useMemo(() => {
+    const left: string[] = [];
+    const right: string[] = [];
+    userColumns?.forEach((col) => {
+      if (col.pinned === 'left') left.push(col.id);
+      else if (col.pinned === 'right') right.push(col.id);
+    });
+    return { left, right };
+  }, [userColumns]);
+
+  const [internalPinning, setInternalPinning] = useState<ColumnPinningState>(initialPinning);
+  const [grouping, setGrouping] = useState<GroupingState>(groupingConfig?.columns ?? []);
+  const [expanded, setExpanded] = useState({});
+  const [internalPagination, setInternalPagination] = useState<PaginationState>({
+    pageIndex: 0,
+    pageSize: paginationConfig?.pageSize ?? DEFAULTS.pageSize,
+  });
+
+  // Wrap pagination setters to call callbacks
+  const handlePaginationChange = (updater: any) => {
+    setInternalPagination((prev) => {
+      const next = typeof updater === 'function' ? updater(prev) : updater;
+      // Call callbacks if pagination config exists
+      if (paginationConfig) {
+        if (next.pageIndex !== prev.pageIndex && paginationConfig.onPageChange) {
+          paginationConfig.onPageChange(next.pageIndex);
+        }
+        if (next.pageSize !== prev.pageSize && paginationConfig.onPageSizeChange) {
+          paginationConfig.onPageSizeChange(next.pageSize);
+        }
+      }
+      return next;
+    });
+  };
+
+  // Sync pagination state to store so adapters can read pageIndex/pageSize
+  useEffect(() => {
+    if (paginationConfig?.enabled) {
+      setPaginationState(internalPagination);
+    }
+  }, [paginationConfig?.enabled, internalPagination, setPaginationState]);
+
+  // Resolve controlled vs uncontrolled
+  const sorting = controlledSorting ?? internalSorting;
+  const setSorting = onSortingChange ?? setInternalSorting;
+  const columnFilters = controlledFilters ?? internalFilters;
+  const setColumnFilters = onColumnFiltersChange ?? setInternalFilters;
+  const columnPinning = controlledPinning ?? internalPinning;
+  const setColumnPinning = onColumnPinningChange ?? setInternalPinning;
+  const rowSelectionState = controlledRowSelection ?? internalRowSelection;
+  const setRowSelection = onRowSelectionChange ?? setInternalRowSelection;
+
+  // ─── Selection config ───
+  const enableRowSelection = selection ? selection.mode !== 'none' : false;
+  const enableMultiRowSelection = selection?.mode === 'multi';
+
+  // ─── TanStack Table Instance ───
+  const table = useReactTable<T>({
+    columns,
+    data: transformedData as T[],
+    enableColumnResizing: true,
+    enableExpanding: true,
+    enableFilters: true,
+    enableGrouping: groupingConfig?.enabled ?? false,
+    enableMultiRowSelection,
+    enableMultiSort: true,
+    enablePinning: true,
+    enableRowSelection,
+    enableSorting: true,
+    getCoreRowModel: getCoreRowModel(),
+    ...(advancedSearch?.enabled ? { globalFilterFn: advancedSearchGlobalFilterFn as any } : {}),
+    getExpandedRowModel: getExpandedRowModel(),
+    getFilteredRowModel: manualFiltering ? undefined : getFilteredRowModel(),
+    getGroupedRowModel: groupingConfig?.enabled ? getGroupedRowModel() : undefined,
+    getRowId: (getRowId as any) ?? ((_, index) => String(index)),
+    // Tree support: configure getSubRows for TanStack Table
+    ...(tree?.enabled
+      ? {
+          filterFromLeafRows: true,
+          getSubRows: (row: any) => {
+            const childrenField = (tree.childrenField as string) || 'children';
+            if (childrenField !== 'subRows' && row[childrenField]) {
+              return row[childrenField];
+            }
+            return row.subRows;
+          },
+        }
+      : {}),
+    getSortedRowModel: manualSorting ? undefined : getSortedRowModel(),
+    manualFiltering: manualFiltering ?? false,
+    manualPagination: paginationConfig?.type === 'offset',
+    manualSorting: manualSorting ?? false,
+    onColumnFiltersChange: setColumnFilters as any,
+    onColumnOrderChange: setColumnOrder,
+    onColumnPinningChange: setColumnPinning as any,
+    onColumnVisibilityChange: setColumnVisibility,
+    onExpandedChange: setExpanded,
+    onGlobalFilterChange: setGlobalFilter,
+    onGroupingChange: setGrouping,
+    onPaginationChange: paginationConfig?.enabled ? handlePaginationChange : undefined,
+    onRowSelectionChange: setRowSelection as any,
+    onSortingChange: setSorting as any,
+    rowCount: dataCount,
+    state: {
+      columnFilters,
+      columnOrder,
+      columnPinning,
+      columnVisibility,
+      expanded,
+      globalFilter,
+      grouping,
+      rowSelection: rowSelectionState,
+      sorting,
+      ...(paginationConfig?.enabled ? { pagination: internalPagination } : {}),
+    },
+    ...(paginationConfig?.enabled && paginationConfig.type !== 'offset'
+      ? { getPaginationRowModel: getPaginationRowModel() }
+      : {}),
+    columnResizeMode: 'onChange',
+  });
+
+  // ─── Scroll Container Ref ───
+  const scrollRef = useRef<HTMLDivElement>(null);
+
+  // ─── TanStack Virtual ───
+  const virtualizer = useGridVirtualizer({
+    overscan: effectiveOverscan,
+    rowHeight: effectiveRowHeight,
+    scrollRef,
+    table,
+  });
+
+  // ─── Sync table + virtualizer + scrollRef into store ───
+  useEffect(() => {
+    setTable(table);
+  }, [table, setTable]);
+  useEffect(() => {
+    setVirtualizer(virtualizer);
+  }, [virtualizer, setVirtualizer]);
+  useEffect(() => {
+    setScrollRef(scrollRef.current);
+  }, [setScrollRef]);
+
+  // ─── Tree Hooks ───
+  // Lazy tree expansion
+  useLazyTreeExpansion({
+    data: transformedData,
+    expanded,
+    setData,
+    setTreeChildrenCache,
+    setTreeLoadingNode,
+    table,
+    tree,
+    treeChildrenCache,
+  });
+
+  // Auto-expand on search
+  useAutoExpandOnSearch({
+    globalFilter,
+    table,
+    tree,
+  });
+
+  // ─── Keyboard Navigation ───
+  // Get the full store state for imperative access in keyboard handler
+  const storeState = useGriddyStore();
+
+  useKeyboardNavigation({
+    editingEnabled: !!onEditCommit,
+    scrollRef,
+    search,
+    selection,
+    storeState,
+    table,
+    tree,
+    virtualizer,
+  });
+
+  // ─── Set initial focus when data loads ───
+  const rowCount = table.getRowModel().rows.length;
+
+  useEffect(() => {
+    setTotalRows(rowCount);
+    if (rowCount > 0 && focusedRowIndex === null) {
+      setFocusedRow(0);
+    }
+  }, [rowCount, focusedRowIndex, setTotalRows, setFocusedRow]);
+
+  // ─── Imperative Ref ───
+  useImperativeHandle(
+    tableRef,
+    () => ({
+      deselectAll: () => table.resetRowSelection(),
+      focusRow: (index: number) => {
+        setFocusedRow(index);
+        virtualizer.scrollToIndex(index, { align: 'auto' });
+      },
+      getTable: () => table,
+      getUIState: () =>
+        ({
+          focusedColumnId: null,
+          focusedRowIndex,
+          isEditing: false,
+          isSearchOpen: false,
+          isSelecting: false,
+          totalRows: rowCount,
+        }) as any,
+      getVirtualizer: () => virtualizer,
+      scrollToRow: (index: number) => virtualizer.scrollToIndex(index, { align: 'auto' }),
+      selectRow: (id: string) => {
+        const row = table.getRowModel().rows.find((r) => r.id === id);
+        row?.toggleSelected(true);
+      },
+      startEditing: (rowId: string, columnId?: string) => {
+        const rowIndex = table.getRowModel().rows.findIndex((r) => r.id === rowId);
+        if (rowIndex >= 0) {
+          setFocusedRow(rowIndex);
+          if (columnId) setFocusedColumn(columnId);
+          setEditing(true);
+        }
+      },
+    }),
+    [table, virtualizer, setFocusedRow, setFocusedColumn, setEditing, focusedRowIndex, rowCount]
+  );
+
+  // ─── Render ───
+  const containerStyle: React.CSSProperties = {
+    height: height ?? '100%',
+    overflow: 'auto',
+    position: 'relative',
+  };
+
+  const focusedRow = focusedRowIndex !== null ? table.getRowModel().rows[focusedRowIndex] : null;
+  const focusedRowId = focusedRow ? `griddy-row-${focusedRow.id}` : undefined;
+
+  return (
+    <div
+      aria-activedescendant={focusedRowId}
+      aria-label="Data grid"
+      aria-rowcount={(data ?? []).length}
+      className={[styles[CSS.root], className].filter(Boolean).join(' ')}
+      role="grid"
+    >
+      {search?.enabled && <SearchOverlay />}
+      {advancedSearch?.enabled && <AdvancedSearchPanel table={table} />}
+      {showToolbar && (
+        <GridToolbar
+          exportFilename={exportFilename}
+          filterPresets={filterPresets}
+          persistenceKey={persistenceKey}
+          table={table}
+        />
+      )}
+      <div
+        className={styles[CSS.container]}
+        ref={scrollRef}
+        style={containerStyle}
+        tabIndex={enableKeyboard ? 0 : undefined}
+      >
+        <TableHeader />
+        {isLoading && (!data || data.length === 0) ? (
+          <GriddyLoadingSkeleton />
+        ) : (
+          <>
+            <VirtualBody />
+            {isLoading && <GriddyLoadingOverlay />}
+          </>
+        )}
+      </div>
+      {paginationConfig?.enabled && (
+        <PaginationControl pageSizeOptions={paginationConfig.pageSizeOptions} table={table} />
+      )}
+    </div>
+  );
+}
+
+export const Griddy = forwardRef(_Griddy) as <T>(
+  props: GriddyProps<T> & React.RefAttributes<GriddyRef<T>>
+) => React.ReactElement;

src/Griddy/core/GriddyStore.ts

@@ -0,0 +1,175 @@
+import type { Table } from '@tanstack/react-table';
+import type {
+  ColumnFiltersState,
+  ColumnPinningState,
+  RowSelectionState,
+  SortingState,
+} from '@tanstack/react-table';
+import type { Virtualizer } from '@tanstack/react-virtual';
+
+import { createSyncStore } from '@warkypublic/zustandsyncstore';
+
+import type {
+  AdvancedSearchConfig,
+  DataAdapter,
+  GriddyColumn,
+  GriddyProps,
+  GriddyUIState,
+  GroupingConfig,
+  InfiniteScrollConfig,
+  PaginationConfig,
+  SearchConfig,
+  SelectionConfig,
+  TreeConfig,
+} from './types';
+
+// ─── Store State ─────────────────────────────────────────────────────────────
+
+/**
+ * Full store state: UI state + synced props + internal references.
+ * Props from GriddyProps are synced automatically via createSyncStore's $sync.
+ * Fields from GriddyProps must be declared here so TypeScript can see them.
+ */
+export interface GriddyStoreState extends GriddyUIState {
+  _scrollRef: HTMLDivElement | null;
+  // ─── Internal refs (set imperatively) ───
+  _table: null | Table<any>;
+  _virtualizer: null | Virtualizer<HTMLDivElement, Element>;
+  advancedSearch?: AdvancedSearchConfig;
+  // ─── Adapter Actions ───
+  appendData: (data: any[]) => void;
+  className?: string;
+  columnFilters?: ColumnFiltersState;
+  columnPinning?: ColumnPinningState;
+  columns?: GriddyColumn<any>[];
+  data?: any[];
+  dataAdapter?: DataAdapter<any>;
+  dataCount?: number;
+  // ─── Error State ───
+  error: Error | null;
+  exportFilename?: string;
+  filterPresets?: boolean;
+  getRowId?: (row: any, index: number) => string;
+  grouping?: GroupingConfig;
+  height?: number | string;
+  infiniteScroll?: InfiniteScrollConfig;
+  isLoading?: boolean;
+  keyboardNavigation?: boolean;
+  manualFiltering?: boolean;
+  manualSorting?: boolean;
+  onColumnFiltersChange?: (filters: ColumnFiltersState) => void;
+  onColumnPinningChange?: (pinning: ColumnPinningState) => void;
+  onEditCommit?: (rowId: string, columnId: string, value: unknown) => Promise<void> | void;
+  onError?: (error: Error) => void;
+  onRowSelectionChange?: (selection: RowSelectionState) => void;
+  onSortingChange?: (sorting: SortingState) => void;
+  overscan?: number;
+  pagination?: PaginationConfig;
+  paginationState?: { pageIndex: number; pageSize: number };
+  persistenceKey?: string;
+  rowHeight?: number;
+
+  rowSelection?: RowSelectionState;
+  search?: SearchConfig;
+  selection?: SelectionConfig;
+  setData: (data: any[]) => void;
+  setDataCount: (count: number) => void;
+  setError: (error: Error | null) => void;
+
+  setInfiniteScroll: (config: InfiniteScrollConfig | undefined) => void;
+  setIsLoading: (loading: boolean) => void;
+  setPaginationState: (state: { pageIndex: number; pageSize: number }) => void;
+  setScrollRef: (el: HTMLDivElement | null) => void;
+  // ─── Internal ref setters ───
+  setTable: (table: Table<any>) => void;
+  setTreeChildrenCache: (nodeId: string, children: any[]) => void;
+
+  setTreeLoadingNode: (nodeId: string, loading: boolean) => void;
+  setVirtualizer: (virtualizer: Virtualizer<HTMLDivElement, Element>) => void;
+  showToolbar?: boolean;
+  sorting?: SortingState;
+  // ─── Tree/Hierarchical Data ───
+  tree?: TreeConfig<any>;
+  treeChildrenCache: Map<string, any[]>;
+  treeLoadingNodes: Set<string>;
+  // ─── Synced from GriddyProps (written by $sync) ───
+  uniqueId?: string;
+}
+
+// ─── Create Store ────────────────────────────────────────────────────────────
+
+export const { Provider: GriddyProvider, useStore: useGriddyStore } = createSyncStore<
+  GriddyStoreState,
+  GriddyProps<any>
+>((set, get) => ({
+  _scrollRef: null,
+  // ─── Internal Refs ───
+  _table: null,
+
+  _virtualizer: null,
+  appendData: (data) => set((state) => ({ data: [...(state.data ?? []), ...data] })),
+  error: null,
+  focusedColumnId: null,
+  // ─── Focus State ───
+  focusedRowIndex: null,
+
+  // ─── Mode State ───
+  isEditing: false,
+
+  isSearchOpen: false,
+  isSelecting: false,
+  moveFocus: (direction, amount) => {
+    const { focusedRowIndex, totalRows } = get();
+    const current = focusedRowIndex ?? 0;
+    const delta = direction === 'down' ? amount : -amount;
+    const next = Math.max(0, Math.min(current + delta, totalRows - 1));
+    set({ focusedRowIndex: next });
+  },
+
+  moveFocusToEnd: () => {
+    const { totalRows } = get();
+    set({ focusedRowIndex: Math.max(0, totalRows - 1) });
+  },
+  moveFocusToStart: () => set({ focusedRowIndex: 0 }),
+  setData: (data) => set({ data }),
+  setDataCount: (count) => set({ dataCount: count }),
+  setEditing: (editing) => set({ isEditing: editing }),
+  setError: (error) => set({ error }),
+  setFocusedColumn: (id) => set({ focusedColumnId: id }),
+  // ─── Actions ───
+  setFocusedRow: (index) => set({ focusedRowIndex: index }),
+  setInfiniteScroll: (config) => set({ infiniteScroll: config }),
+  setIsLoading: (loading) => set({ isLoading: loading }),
+  setPaginationState: (state) => set({ paginationState: state }),
+  setScrollRef: (el) => set({ _scrollRef: el }),
+
+  setSearchOpen: (open) => set({ isSearchOpen: open }),
+
+  setSelecting: (selecting) => set({ isSelecting: selecting }),
+  // ─── Internal Ref Setters ───
+  setTable: (table) => set({ _table: table }),
+
+  setTotalRows: (count) => set({ totalRows: count }),
+  setTreeChildrenCache: (nodeId, children) =>
+    set((state) => {
+      const newMap = new Map(state.treeChildrenCache);
+      newMap.set(nodeId, children);
+      return { treeChildrenCache: newMap };
+    }),
+  setTreeLoadingNode: (nodeId, loading) =>
+    set((state) => {
+      const newSet = new Set(state.treeLoadingNodes);
+      if (loading) {
+        newSet.add(nodeId);
+      } else {
+        newSet.delete(nodeId);
+      }
+      return { treeLoadingNodes: newSet };
+    }),
+  setVirtualizer: (virtualizer) => set({ _virtualizer: virtualizer }),
+  // ─── Row Count ───
+  totalRows: 0,
+  treeChildrenCache: new Map(),
+  // ─── Tree State ───
+  treeLoadingNodes: new Set(),
+}));

src/Griddy/core/columnMapper.ts

@@ -0,0 +1,132 @@
+import type { ColumnDef } from '@tanstack/react-table';
+
+import type { GriddyColumn, SelectionConfig } from './types';
+
+import { createOperatorFilter } from '../features/filtering';
+import { DEFAULTS, SELECTION_COLUMN_ID, SELECTION_COLUMN_SIZE } from './constants';
+
+/**
+ * Retrieves the original GriddyColumn from a TanStack column's meta.
+ */
+export function getGriddyColumn<T>(column: {
+  columnDef: ColumnDef<T>;
+}): GriddyColumn<T> | undefined {
+  return (column.columnDef.meta as { griddy?: GriddyColumn<T> })?.griddy;
+}
+
+/**
+ * Maps Griddy's user-facing GriddyColumn<T> definitions to TanStack Table ColumnDef<T>[].
+ * Supports header grouping and optionally prepends a selection checkbox column.
+ */
+export function mapColumns<T>(
+  columns: GriddyColumn<T>[],
+  selection?: SelectionConfig
+): ColumnDef<T>[] {
+  // Group columns by headerGroup
+  const grouped = new Map<string, GriddyColumn<T>[]>();
+  const ungrouped: GriddyColumn<T>[] = [];
+
+  columns.forEach((col) => {
+    if (col.headerGroup) {
+      const existing = grouped.get(col.headerGroup) || [];
+      existing.push(col);
+      grouped.set(col.headerGroup, existing);
+    } else {
+      ungrouped.push(col);
+    }
+  });
+
+  // Build column definitions
+  const mapped: ColumnDef<T>[] = [];
+
+  // Add ungrouped columns first
+  ungrouped.forEach((col) => {
+    mapped.push(mapSingleColumn(col));
+  });
+
+  // Add grouped columns
+  grouped.forEach((groupColumns, groupName) => {
+    const groupDef: ColumnDef<T> = {
+      columns: groupColumns.map((col) => mapSingleColumn(col)),
+      header: groupName,
+      id: `group-${groupName}`,
+    };
+    mapped.push(groupDef);
+  });
+
+  // Prepend checkbox column if selection is enabled
+  if (selection && selection.mode !== 'none' && selection.showCheckbox !== false) {
+    const checkboxCol: ColumnDef<T> = {
+      cell: 'select-row', // Rendered by TableCell with actual checkbox
+      enableColumnFilter: false,
+      enableHiding: false,
+      enableResizing: false,
+      enableSorting: false,
+      header:
+        selection.mode === 'multi'
+          ? 'select-all' // Rendered by TableHeader with actual checkbox
+          : '',
+      id: SELECTION_COLUMN_ID,
+      size: SELECTION_COLUMN_SIZE,
+    };
+    mapped.unshift(checkboxCol);
+  }
+
+  return mapped;
+}
+
+/**
+ * Converts a single GriddyColumn to a TanStack ColumnDef
+ */
+function mapSingleColumn<T>(col: GriddyColumn<T>): ColumnDef<T> {
+  const isStringAccessor = typeof col.accessor !== 'function';
+
+  const def: ColumnDef<T> = {
+    id: col.id,
+    // Use accessorKey for string keys (enables TanStack auto-detection of sort/filter),
+    // accessorFn for function accessors
+    ...(isStringAccessor
+      ? { accessorKey: col.accessor as string }
+      : { accessorFn: col.accessor as (row: T) => unknown }),
+    aggregationFn: col.aggregationFn,
+    enableColumnFilter: col.filterable ?? false,
+    enableGrouping: col.groupable ?? false,
+    enableHiding: true,
+    enablePinning: true,
+    enableResizing: true,
+    enableSorting: col.sortable ?? true,
+    header: () => col.header,
+    maxSize: col.maxWidth ?? DEFAULTS.maxColumnWidth,
+    meta: { griddy: col },
+    minSize: col.minWidth ?? DEFAULTS.minColumnWidth,
+    size: col.width,
+  };
+
+  // For function accessors, TanStack can't auto-detect the sort type, so provide a default
+  if (col.sortFn) {
+    def.sortingFn = col.sortFn;
+  } else if (!isStringAccessor && col.sortable !== false) {
+    // Use alphanumeric sorting for function accessors
+    def.sortingFn = 'alphanumeric';
+  }
+
+  if (col.filterFn) {
+    def.filterFn = col.filterFn;
+  } else if (col.filterable) {
+    def.filterFn = createOperatorFilter();
+  }
+
+  if (col.renderer) {
+    const renderer = col.renderer;
+    def.cell = (info) =>
+      renderer({
+        column: col,
+        columnIndex: info.cell.column.getIndex(),
+        row: info.row.original,
+        rowIndex: info.row.index,
+        value: info.getValue(),
+      });
+  }
+
+  return def;
+}

src/Griddy/core/constants.ts

@@ -0,0 +1,47 @@
+// ─── CSS Class Names ─────────────────────────────────────────────────────────
+
+export const CSS = {
+  cell: 'griddy-cell',
+  cellEditing: 'griddy-cell--editing',
+  checkbox: 'griddy-checkbox',
+  container: 'griddy-container',
+  filterButton: 'griddy-filter-button',
+  filterButtonActive: 'griddy-filter-button--active',
+  headerCell: 'griddy-header-cell',
+  headerCellContent: 'griddy-header-cell-content',
+  headerCellSortable: 'griddy-header-cell--sortable',
+  headerCellSorted: 'griddy-header-cell--sorted',
+  headerRow: 'griddy-header-row',
+  resizeHandle: 'griddy-resize-handle',
+  root: 'griddy',
+  row: 'griddy-row',
+  rowEven: 'griddy-row--even',
+  rowFocused: 'griddy-row--focused',
+  rowOdd: 'griddy-row--odd',
+  rowSelected: 'griddy-row--selected',
+  searchInput: 'griddy-search-input',
+  searchOverlay: 'griddy-search-overlay',
+  sortIndicator: 'griddy-sort-indicator',
+  table: 'griddy-table',
+  tbody: 'griddy-tbody',
+  thead: 'griddy-thead',
+} as const
+
+// ─── Defaults ────────────────────────────────────────────────────────────────
+
+export const DEFAULTS = {
+  filterDebounceMs: 300,
+  headerHeight: 36,
+  maxColumnWidth: 800,
+  minColumnWidth: 50,
+  overscan: 10,
+  pageSize: 50,
+  pageSizeOptions: [25, 50, 100] as number[],
+  rowHeight: 36,
+  searchDebounceMs: 300,
+} as const
+
+// ─── Selection Column ────────────────────────────────────────────────────────
+
+export const SELECTION_COLUMN_ID = '_selection'
+export const SELECTION_COLUMN_SIZE = 40

src/Griddy/core/types.ts

@@ -0,0 +1,367 @@
+import type {
+  ColumnDef,
+  ColumnFiltersState,
+  ColumnOrderState,
+  ColumnPinningState,
+  ExpandedState,
+  FilterFn,
+  GroupingState,
+  PaginationState,
+  RowSelectionState,
+  SortingFn,
+  SortingState,
+  Table,
+  VisibilityState,
+} from '@tanstack/react-table';
+import type { Virtualizer } from '@tanstack/react-virtual';
+import type { ReactNode } from 'react';
+
+import type { EditorConfig } from '../editors';
+import type { FilterConfig } from '../features/filtering';
+
+// ─── Column Definition ───────────────────────────────────────────────────────
+
+export interface AdvancedSearchConfig {
+  enabled: boolean;
+}
+
+// ─── Cell Rendering ──────────────────────────────────────────────────────────
+
+export type CellRenderer<T> = (props: RendererProps<T>) => ReactNode;
+
+export interface DataAdapter<T> {
+  delete?: (row: T) => Promise<void>;
+  fetch: (config: FetchConfig) => Promise<GriddyDataSource<T>>;
+  save?: (row: T) => Promise<void>;
+}
+
+// ─── Editors ─────────────────────────────────────────────────────────────────
+
+export type EditorComponent<T> = (props: EditorProps<T>) => ReactNode;
+
+export interface EditorProps<T> {
+  column: GriddyColumn<T>;
+  onCancel: () => void;
+  onCommit: (newValue: unknown) => void;
+  onMoveNext: () => void;
+  onMovePrev: () => void;
+  row: T;
+  rowIndex: number;
+  value: unknown;
+}
+
+// ─── Selection ───────────────────────────────────────────────────────────────
+
+export interface FetchConfig {
+  cursor?: string;
+  filters?: ColumnFiltersState;
+  globalFilter?: string;
+  page?: number;
+  pageSize?: number;
+  sorting?: SortingState;
+}
+
+// ─── Search ──────────────────────────────────────────────────────────────────
+
+export interface GriddyColumn<T> {
+  accessor: ((row: T) => unknown) | keyof T;
+  aggregationFn?: 'count' | 'max' | 'mean' | 'median' | 'min' | 'sum' | 'unique' | 'uniqueCount';
+  editable?: ((row: T) => boolean) | boolean;
+  editor?: EditorComponent<T>;
+  editorConfig?: EditorConfig;
+  filterable?: boolean;
+  filterConfig?: FilterConfig;
+  filterFn?: FilterFn<T>;
+  groupable?: boolean;
+  header: ReactNode | string;
+  headerGroup?: string;
+  hidden?: boolean;
+  id: string;
+  maxWidth?: number;
+  minWidth?: number;
+  pinned?: 'left' | 'right';
+  renderer?: CellRenderer<T>;
+  /** Metadata passed to custom renderers (ProgressBar, Badge, Image, Sparkline) */
+  rendererMeta?: Record<string, unknown>;
+  searchable?: boolean;
+  sortable?: boolean;
+  sortFn?: SortingFn<T>;
+  width?: number;
+}
+
+// ─── Pagination ──────────────────────────────────────────────────────────────
+
+export interface GriddyDataSource<T> {
+  data: T[];
+  error?: Error;
+  isLoading?: boolean;
+  pageInfo?: { cursor?: string; hasNextPage: boolean };
+  total?: number;
+}
+
+export interface GriddyProps<T> {
+  // ─── Advanced Search ───
+  advancedSearch?: AdvancedSearchConfig;
+  // ─── Children (adapters, etc.) ───
+  children?: ReactNode;
+  // ─── Styling ───
+  className?: string;
+  // ─── Filtering ───
+  /** Controlled column filters state */
+  columnFilters?: ColumnFiltersState;
+  /** Controlled column pinning state */
+  columnPinning?: ColumnPinningState;
+  /** Column definitions */
+  columns: GriddyColumn<T>[];
+  /** Data array */
+  data: T[];
+  // ─── Data Adapter ───
+  dataAdapter?: DataAdapter<T>;
+  /** Total row count (for server-side pagination/filtering). If provided, enables manual mode. */
+  dataCount?: number;
+  /** Export filename. Default: 'export.csv' */
+  exportFilename?: string;
+
+  // ─── Filter Presets ───
+  /** Enable filter presets save/load in toolbar. Default: false */
+  filterPresets?: boolean;
+
+  /** Stable row identity function */
+  getRowId?: (row: T, index: number) => string;
+  // ─── Grouping ───
+  grouping?: GroupingConfig;
+  /** Container height */
+  height?: number | string;
+  // ─── Infinite Scroll ───
+  /** Infinite scroll configuration */
+  infiniteScroll?: InfiniteScrollConfig;
+
+  // ─── Loading ───
+  /** Show loading skeleton/overlay. Default: false */
+  isLoading?: boolean;
+  // ─── Keyboard ───
+  /** Enable keyboard navigation. Default: true */
+  keyboardNavigation?: boolean;
+  /** Manual filtering mode - filtering handled externally (server-side). Default: false */
+  manualFiltering?: boolean;
+  /** Manual sorting mode - sorting handled externally (server-side). Default: false */
+  manualSorting?: boolean;
+  onColumnFiltersChange?: (filters: ColumnFiltersState) => void;
+  onColumnPinningChange?: (pinning: ColumnPinningState) => void;
+
+  // ─── Editing ───
+  onEditCommit?: (rowId: string, columnId: string, value: unknown) => Promise<void> | void;
+  // ─── Error Handling ───
+  /** Callback when a render error is caught by the error boundary */
+  onError?: (error: Error) => void;
+  /** Callback before the error boundary retries rendering */
+  onRetry?: () => void;
+  /** Selection change callback */
+  onRowSelectionChange?: (selection: RowSelectionState) => void;
+
+  onSortingChange?: (sorting: SortingState) => void;
+
+  /** Overscan row count. Default: 10 */
+  overscan?: number;
+
+  // ─── Pagination ───
+  pagination?: PaginationConfig;
+
+  // ─── Persistence ───
+  /** localStorage key prefix for persisting column layout */
+  persistenceKey?: string;
+
+  // ─── Virtualization ───
+  /** Row height in pixels. Default: 36 */
+  rowHeight?: number;
+  /** Controlled row selection state */
+  rowSelection?: RowSelectionState;
+  // ─── Search ───
+  search?: SearchConfig;
+
+  // ─── Selection ───
+  /** Selection configuration */
+  selection?: SelectionConfig;
+
+  // ─── Toolbar ───
+  /** Show toolbar with export and column visibility controls. Default: false */
+  showToolbar?: boolean;
+
+  // ─── Sorting ───
+  /** Controlled sorting state */
+  sorting?: SortingState;
+
+  // ─── Tree/Hierarchical Data ───
+  /** Tree/hierarchical data configuration */
+  tree?: TreeConfig<T>;
+
+  /** Unique identifier for persistence */
+  uniqueId?: string;
+}
+
+// ─── Data Adapter ────────────────────────────────────────────────────────────
+
+export interface GriddyRef<T = unknown> {
+  deselectAll: () => void;
+  focusRow: (index: number) => void;
+  getTable: () => Table<T>;
+  getUIState: () => GriddyUIState;
+  getVirtualizer: () => Virtualizer<HTMLDivElement, Element>;
+  scrollToRow: (index: number) => void;
+  selectRow: (id: string) => void;
+  startEditing: (rowId: string, columnId?: string) => void;
+}
+
+export interface GriddyUIState {
+  focusedColumnId: null | string;
+  // Focus
+  focusedRowIndex: null | number;
+
+  // Modes
+  isEditing: boolean;
+  isSearchOpen: boolean;
+  isSelecting: boolean;
+
+  moveFocus: (direction: 'down' | 'up', amount: number) => void;
+
+  moveFocusToEnd: () => void;
+  moveFocusToStart: () => void;
+  setEditing: (editing: boolean) => void;
+  setFocusedColumn: (id: null | string) => void;
+  // Actions
+  setFocusedRow: (index: null | number) => void;
+  setSearchOpen: (open: boolean) => void;
+  setSelecting: (selecting: boolean) => void;
+  setTotalRows: (count: number) => void;
+  // Row count (synced from table)
+  totalRows: number;
+}
+
+export interface GroupingConfig {
+  columns?: string[];
+  enabled: boolean;
+}
+
+// ─── Grouping ────────────────────────────────────────────────────────────────
+
+export interface InfiniteScrollConfig {
+  /** Enable infinite scroll */
+  enabled: boolean;
+  /** Whether there is more data to load */
+  hasMore?: boolean;
+  /** Whether data is currently loading */
+  isLoading?: boolean;
+  /** Callback to load more data. Should update the data array. */
+  onLoadMore?: () => Promise<void> | void;
+  /** Threshold in rows from the end to trigger loading. Default: 10 */
+  threshold?: number;
+}
+
+export interface PaginationConfig {
+  enabled: boolean;
+  onPageChange?: (page: number) => void;
+  onPageSizeChange?: (pageSize: number) => void;
+  pageSize: number;
+  pageSizeOptions?: number[];
+  type: 'cursor' | 'offset';
+}
+
+// ─── Main Props ──────────────────────────────────────────────────────────────
+
+export interface RendererProps<T> {
+  column: GriddyColumn<T>;
+  columnIndex: number;
+  isEditing?: boolean;
+  row: T;
+  rowIndex: number;
+  searchQuery?: string;
+  value: unknown;
+}
+
+// ─── UI State (Zustand Store) ────────────────────────────────────────────────
+
+export interface SearchConfig {
+  caseSensitive?: boolean;
+  debounceMs?: number;
+  enabled: boolean;
+  fuzzy?: boolean;
+  highlightMatches?: boolean;
+  placeholder?: string;
+}
+
+// ─── Ref API ─────────────────────────────────────────────────────────────────
+
+export interface SelectionConfig {
+  /** 'none' = no selection, 'single' = one row at a time, 'multi' = multiple rows */
+  mode: 'multi' | 'none' | 'single';
+  /** Maintain selection across pagination/sorting. Default: true */
+  preserveSelection?: boolean;
+  /** Allow clicking row body to toggle selection. Default: true */
+  selectOnClick?: boolean;
+  /** Show checkbox column (auto-added as first column). Default: true when mode !== 'none' */
+  showCheckbox?: boolean;
+}
+
+// ─── Tree/Hierarchical Data ──────────────────────────────────────────────────
+
+export interface TreeConfig<T> {
+  // ─── UI Configuration ───
+  /** Auto-expand parent nodes when search matches children. Default: true */
+  autoExpandOnSearch?: boolean;
+
+  // ─── Nested Mode ───
+  /** Field name for children array in nested mode. Default: 'children' */
+  childrenField?: keyof T | string;
+
+  // ─── Expansion State ───
+  /** Default expanded state (record or array of IDs) */
+  defaultExpanded?: Record<string, boolean> | string[];
+
+  /** Enable tree/hierarchical data mode */
+  enabled: boolean;
+
+  /** Controlled expanded state */
+  expanded?: Record<string, boolean>;
+  // ─── Lazy Mode ───
+  /** Async function to fetch children for a parent node */
+  getChildren?: (parent: T) => Promise<T[]> | T[];
+
+  /** Function to determine if a node has children (for lazy mode) */
+  hasChildren?: (row: T) => boolean;
+  /** Custom icons for tree states */
+  icons?: {
+    collapsed?: ReactNode;
+    expanded?: ReactNode;
+    leaf?: ReactNode;
+  };
+  /** Indentation size per depth level in pixels. Default: 20 */
+  indentSize?: number;
+
+  /** Maximum tree depth to render. Default: Infinity */
+  maxDepth?: number;
+  /** Tree data mode. Default: 'nested' */
+  mode?: 'flat' | 'lazy' | 'nested';
+  /** Callback when expanded state changes */
+  onExpandedChange?: (expanded: Record<string, boolean>) => void;
+  // ─── Flat Mode ───
+  /** Field name for parent ID in flat mode. Default: 'parentId' */
+  parentIdField?: keyof T | string;
+  /** Show expand/collapse icon. Default: true */
+  showExpandIcon?: boolean;
+}
+
+// ─── Re-exports for convenience ──────────────────────────────────────────────
+
+export type {
+  ColumnDef,
+  ColumnFiltersState,
+  ColumnOrderState,
+  ColumnPinningState,
+  ExpandedState,
+  GroupingState,
+  PaginationState,
+  RowSelectionState,
+  SortingState,
+  Table,
+  VisibilityState,
+};

src/Griddy/editors/CheckboxEditor.tsx

@@ -0,0 +1,43 @@
+import { Checkbox } from '@mantine/core'
+import { useEffect, useState } from 'react'
+
+import type { BaseEditorProps } from './types'
+
+export function CheckboxEditor({ autoFocus = true, onCancel, onCommit, onMoveNext, onMovePrev, value }: BaseEditorProps<boolean>) {
+  const [checked, setChecked] = useState(Boolean(value))
+
+  useEffect(() => {
+    setChecked(Boolean(value))
+  }, [value])
+
+  const handleKeyDown = (e: React.KeyboardEvent) => {
+    if (e.key === 'Enter') {
+      e.preventDefault()
+      onCommit(checked)
+    } else if (e.key === 'Escape') {
+      e.preventDefault()
+      onCancel()
+    } else if (e.key === 'Tab') {
+      e.preventDefault()
+      onCommit(checked)
+      if (e.shiftKey) {
+        onMovePrev?.()
+      } else {
+        onMoveNext?.()
+      }
+    } else if (e.key === ' ') {
+      e.preventDefault()
+      setChecked(!checked)
+    }
+  }
+
+  return (
+    <Checkbox
+      autoFocus={autoFocus}
+      checked={checked}
+      onChange={(e) => setChecked(e.currentTarget.checked)}
+      onKeyDown={handleKeyDown}
+      size="xs"
+    />
+  )
+}

src/Griddy/editors/DateEditor.tsx

@@ -0,0 +1,46 @@
+import { DatePickerInput } from '@mantine/dates'
+import { useEffect, useState } from 'react'
+
+import type { BaseEditorProps } from './types'
+
+export function DateEditor({ autoFocus = true, onCancel, onCommit, onMoveNext, onMovePrev, value }: BaseEditorProps<Date | string>) {
+  const [dateValue, setDateValue] = useState<Date | null>(() =>
+    value ? new Date(value) : null
+  )
+
+  useEffect(() => {
+    setDateValue(value ? new Date(value) : null)
+  }, [value])
+
+  const handleKeyDown = (e: React.KeyboardEvent) => {
+    if (e.key === 'Enter') {
+      e.preventDefault()
+      onCommit(dateValue ?? '')
+    } else if (e.key === 'Escape') {
+      e.preventDefault()
+      onCancel()
+    } else if (e.key === 'Tab') {
+      e.preventDefault()
+      onCommit(dateValue ?? '')
+      if (e.shiftKey) {
+        onMovePrev?.()
+      } else {
+        onMoveNext?.()
+      }
+    }
+  }
+
+  return (
+    <DatePickerInput
+      autoFocus={autoFocus}
+      clearable
+      onChange={(date) => {
+        const dateVal = date ? (typeof date === 'string' ? new Date(date) : date) : null
+        setDateValue(dateVal)
+      }}
+      onKeyDown={handleKeyDown}
+      size="xs"
+      value={dateValue}
+    />
+  )
+}

src/Griddy/editors/NumericEditor.tsx

@@ -0,0 +1,49 @@
+import { NumberInput } from '@mantine/core'
+import { useEffect, useState } from 'react'
+
+import type { BaseEditorProps } from './types'
+
+interface NumericEditorProps extends BaseEditorProps<number> {
+  max?: number
+  min?: number
+  step?: number
+}
+
+export function NumericEditor({ autoFocus = true, max, min, onCancel, onCommit, onMoveNext, onMovePrev, step = 1, value }: NumericEditorProps) {
+  const [inputValue, setInputValue] = useState<number | string>(value ?? '')
+
+  useEffect(() => {
+    setInputValue(value ?? '')
+  }, [value])
+
+  const handleKeyDown = (e: React.KeyboardEvent) => {
+    if (e.key === 'Enter') {
+      e.preventDefault()
+      onCommit(typeof inputValue === 'number' ? inputValue : Number(inputValue))
+    } else if (e.key === 'Escape') {
+      e.preventDefault()
+      onCancel()
+    } else if (e.key === 'Tab') {
+      e.preventDefault()
+      onCommit(typeof inputValue === 'number' ? inputValue : Number(inputValue))
+      if (e.shiftKey) {
+        onMovePrev?.()
+      } else {
+        onMoveNext?.()
+      }
+    }
+  }
+
+  return (
+    <NumberInput
+      autoFocus={autoFocus}
+      max={max}
+      min={min}
+      onChange={(val) => setInputValue(val ?? '')}
+      onKeyDown={handleKeyDown}
+      size="xs"
+      step={step}
+      value={inputValue}
+    />
+  )
+}

src/Griddy/editors/SelectEditor.tsx

@@ -0,0 +1,59 @@
+import { Select } from '@mantine/core';
+import { useEffect, useState } from 'react';
+
+import type { BaseEditorProps, SelectOption } from './types';
+
+interface SelectEditorProps extends BaseEditorProps<any> {
+  options: SelectOption[];
+}
+
+export function SelectEditor({
+  autoFocus = true,
+  onCancel,
+  onCommit,
+  onMoveNext,
+  onMovePrev,
+  options,
+  value,
+}: SelectEditorProps) {
+  const [selectedValue, setSelectedValue] = useState<null | string>(
+    value != null ? String(value) : null
+  );
+
+  useEffect(() => {
+    setSelectedValue(value != null ? String(value) : null);
+  }, [value]);
+
+  const handleKeyDown = (e: React.KeyboardEvent) => {
+    if (e.key === 'Enter') {
+      e.preventDefault();
+      // Find the actual value from options
+      const option = options.find((opt) => String(opt.value) === selectedValue);
+      onCommit(option?.value ?? selectedValue);
+    } else if (e.key === 'Escape') {
+      e.preventDefault();
+      onCancel();
+    } else if (e.key === 'Tab') {
+      e.preventDefault();
+      const option = options.find((opt) => String(opt.value) === selectedValue);
+      onCommit(option?.value ?? selectedValue);
+      if (e.shiftKey) {
+        onMovePrev?.();
+      } else {
+        onMoveNext?.();
+      }
+    }
+  };
+
+  return (
+    <Select
+      autoFocus={autoFocus}
+      data={options.map((opt) => ({ label: opt.label, value: String(opt.value) }))}
+      onChange={(val) => setSelectedValue(val)}
+      onKeyDown={handleKeyDown}
+      searchable
+      size="xs"
+      value={selectedValue}
+    />
+  );
+}

src/Griddy/editors/TextEditor.tsx

@@ -0,0 +1,40 @@
+import { TextInput } from '@mantine/core'
+import { useEffect, useState } from 'react'
+
+import type { BaseEditorProps } from './types'
+
+export function TextEditor({ autoFocus = true, onCancel, onCommit, onMoveNext, onMovePrev, value }: BaseEditorProps<string>) {
+  const [inputValue, setInputValue] = useState(value ?? '')
+
+  useEffect(() => {
+    setInputValue(value ?? '')
+  }, [value])
+
+  const handleKeyDown = (e: React.KeyboardEvent) => {
+    if (e.key === 'Enter') {
+      e.preventDefault()
+      onCommit(inputValue)
+    } else if (e.key === 'Escape') {
+      e.preventDefault()
+      onCancel()
+    } else if (e.key === 'Tab') {
+      e.preventDefault()
+      onCommit(inputValue)
+      if (e.shiftKey) {
+        onMovePrev?.()
+      } else {
+        onMoveNext?.()
+      }
+    }
+  }
+
+  return (
+    <TextInput
+      autoFocus={autoFocus}
+      onChange={(e) => setInputValue(e.currentTarget.value)}
+      onKeyDown={handleKeyDown}
+      size="xs"
+      value={inputValue}
+    />
+  )
+}

src/Griddy/editors/index.ts

@@ -0,0 +1,6 @@
+export { CheckboxEditor } from './CheckboxEditor'
+export { DateEditor } from './DateEditor'
+export { NumericEditor } from './NumericEditor'
+export { SelectEditor } from './SelectEditor'
+export { TextEditor } from './TextEditor'
+export type { BaseEditorProps, EditorComponent, EditorConfig, EditorType, SelectOption, ValidationResult, ValidationRule } from './types'

src/Griddy/editors/types.ts

@@ -0,0 +1,45 @@
+import type { ReactNode } from 'react';
+
+// ─── Editor Props ────────────────────────────────────────────────────────────
+
+export interface BaseEditorProps<T = any> {
+  autoFocus?: boolean;
+  onCancel: () => void;
+  onCommit: (value: T) => void;
+  onMoveNext?: () => void;
+  onMovePrev?: () => void;
+  value: T;
+}
+
+// ─── Validation ──────────────────────────────────────────────────────────────
+
+export type EditorComponent<T = any> = (props: BaseEditorProps<T>) => ReactNode;
+
+export interface EditorConfig {
+  max?: number;
+  min?: number;
+  options?: SelectOption[];
+  placeholder?: string;
+  step?: number;
+  type?: EditorType;
+  validation?: ValidationRule[];
+}
+
+// ─── Editor Registry ─────────────────────────────────────────────────────────
+
+export type EditorType = 'checkbox' | 'date' | 'number' | 'select' | 'text';
+
+export interface SelectOption {
+  label: string;
+  value: any;
+}
+
+export interface ValidationResult {
+  errors: string[];
+  isValid: boolean;
+}
+
+export interface ValidationRule<T = any> {
+  message: string;
+  validate: (value: T) => boolean;
+}

src/Griddy/features/advancedSearch/AdvancedSearchPanel.tsx

@@ -0,0 +1,146 @@
+import type { Table } from '@tanstack/react-table';
+
+import { Button, Group, SegmentedControl, Stack, Text } from '@mantine/core';
+import { IconPlus } from '@tabler/icons-react';
+import { useCallback, useMemo, useState } from 'react';
+
+import type { AdvancedSearchState, BooleanOperator, SearchCondition } from './types';
+
+import { useGriddyStore } from '../../core/GriddyStore';
+import styles from '../../styles/griddy.module.css';
+import { advancedFilter } from './advancedFilterFn';
+import { SearchConditionRow } from './SearchConditionRow';
+
+let nextId = 1;
+
+interface AdvancedSearchPanelProps {
+  table: Table<any>;
+}
+
+// Custom global filter function that handles advanced search
+export function advancedSearchGlobalFilterFn(
+  row: any,
+  _columnId: string,
+  filterValue: any
+): boolean {
+  if (filterValue?._advancedSearch) {
+    return advancedFilter(row, filterValue._advancedSearch);
+  }
+  // Fallback to default string search
+  if (typeof filterValue === 'string') {
+    const search = filterValue.toLowerCase();
+    return row.getAllCells().some((cell: any) => {
+      const val = cell.getValue();
+      return String(val ?? '')
+        .toLowerCase()
+        .includes(search);
+    });
+  }
+  return true;
+}
+
+export function AdvancedSearchPanel({ table }: AdvancedSearchPanelProps) {
+  const userColumns = useGriddyStore((s) => s.columns) ?? [];
+  const [searchState, setSearchState] = useState<AdvancedSearchState>({
+    booleanOperator: 'AND',
+    conditions: [createCondition()],
+  });
+
+  const columnOptions = useMemo(
+    () =>
+      userColumns
+        .filter((c) => c.searchable !== false)
+        .map((c) => ({ label: String(c.header), value: c.id })),
+    [userColumns]
+  );
+
+  const handleConditionChange = useCallback((index: number, condition: SearchCondition) => {
+    setSearchState((prev) => {
+      const conditions = [...prev.conditions];
+      conditions[index] = condition;
+      return { ...prev, conditions };
+    });
+  }, []);
+
+  const handleRemove = useCallback((index: number) => {
+    setSearchState((prev) => ({
+      ...prev,
+      conditions: prev.conditions.filter((_, i) => i !== index),
+    }));
+  }, []);
+
+  const handleAdd = useCallback(() => {
+    setSearchState((prev) => ({
+      ...prev,
+      conditions: [...prev.conditions, createCondition()],
+    }));
+  }, []);
+
+  const handleApply = useCallback(() => {
+    const activeConditions = searchState.conditions.filter((c) => c.columnId && c.value);
+    if (activeConditions.length === 0) {
+      table.setGlobalFilter(undefined);
+      return;
+    }
+    // Use globalFilter with a custom function key
+    table.setGlobalFilter({ _advancedSearch: searchState });
+  }, [searchState, table]);
+
+  const handleClear = useCallback(() => {
+    setSearchState({ booleanOperator: 'AND', conditions: [createCondition()] });
+    table.setGlobalFilter(undefined);
+  }, [table]);
+
+  return (
+    <div className={styles['griddy-advanced-search']}>
+      <Stack gap="xs">
+        <Group justify="space-between">
+          <Text fw={600} size="sm">
+            Advanced Search
+          </Text>
+          <SegmentedControl
+            data={['AND', 'OR', 'NOT']}
+            onChange={(val) =>
+              setSearchState((prev) => ({ ...prev, booleanOperator: val as BooleanOperator }))
+            }
+            size="xs"
+            value={searchState.booleanOperator}
+          />
+        </Group>
+
+        {searchState.conditions.map((condition, index) => (
+          <SearchConditionRow
+            columns={columnOptions}
+            condition={condition}
+            key={condition.id}
+            onChange={(c) => handleConditionChange(index, c)}
+            onRemove={() => handleRemove(index)}
+          />
+        ))}
+
+        <Group justify="space-between">
+          <Button
+            leftSection={<IconPlus size={14} />}
+            onClick={handleAdd}
+            size="xs"
+            variant="subtle"
+          >
+            Add condition
+          </Button>
+          <Group gap="xs">
+            <Button onClick={handleClear} size="xs" variant="subtle">
+              Clear
+            </Button>
+            <Button onClick={handleApply} size="xs">
+              Search
+            </Button>
+          </Group>
+        </Group>
+      </Stack>
+    </div>
+  );
+}
+
+function createCondition(): SearchCondition {
+  return { columnId: '', id: String(nextId++), operator: 'contains', value: '' };
+}

src/Griddy/features/advancedSearch/SearchConditionRow.tsx

@@ -0,0 +1,58 @@
+import { ActionIcon, Group, Select, TextInput } from '@mantine/core'
+import { IconTrash } from '@tabler/icons-react'
+
+import type { SearchCondition } from './types'
+
+interface SearchConditionRowProps {
+  columns: { label: string; value: string }[]
+  condition: SearchCondition
+  onChange: (condition: SearchCondition) => void
+  onRemove: () => void
+}
+
+const OPERATORS = [
+  { label: 'Contains', value: 'contains' },
+  { label: 'Equals', value: 'equals' },
+  { label: 'Starts with', value: 'startsWith' },
+  { label: 'Ends with', value: 'endsWith' },
+  { label: 'Not contains', value: 'notContains' },
+  { label: 'Greater than', value: 'greaterThan' },
+  { label: 'Less than', value: 'lessThan' },
+]
+
+export function SearchConditionRow({ columns, condition, onChange, onRemove }: SearchConditionRowProps) {
+  return (
+    <Group gap="xs" wrap="nowrap">
+      <Select
+        data={columns}
+        onChange={(val) => onChange({ ...condition, columnId: val ?? '' })}
+        placeholder="Column"
+        size="xs"
+        value={condition.columnId || null}
+        w={140}
+      />
+      <Select
+        data={OPERATORS}
+        onChange={(val) => onChange({ ...condition, operator: (val as SearchCondition['operator']) ?? 'contains' })}
+        size="xs"
+        value={condition.operator}
+        w={130}
+      />
+      <TextInput
+        onChange={(e) => onChange({ ...condition, value: e.currentTarget.value })}
+        placeholder="Value"
+        size="xs"
+        style={{ flex: 1 }}
+        value={condition.value}
+      />
+      <ActionIcon
+        color="red"
+        onClick={onRemove}
+        size="sm"
+        variant="subtle"
+      >
+        <IconTrash size={14} />
+      </ActionIcon>
+    </Group>
+  )
+}

src/Griddy/features/advancedSearch/advancedFilterFn.ts

@@ -0,0 +1,45 @@
+import type { Row } from '@tanstack/react-table';
+
+import type { AdvancedSearchState, SearchCondition } from './types';
+
+export function advancedFilter<T>(row: Row<T>, searchState: AdvancedSearchState): boolean {
+  const { booleanOperator, conditions } = searchState;
+  const active = conditions.filter((c) => c.columnId && c.value);
+
+  if (active.length === 0) return true;
+
+  switch (booleanOperator) {
+    case 'AND':
+      return active.every((c) => matchCondition(row, c));
+    case 'NOT':
+      return !active.some((c) => matchCondition(row, c));
+    case 'OR':
+      return active.some((c) => matchCondition(row, c));
+    default:
+      return true;
+  }
+}
+
+function matchCondition<T>(row: Row<T>, condition: SearchCondition): boolean {
+  const cellValue = String(row.getValue(condition.columnId) ?? '').toLowerCase();
+  const searchValue = condition.value.toLowerCase();
+
+  switch (condition.operator) {
+    case 'contains':
+      return cellValue.includes(searchValue);
+    case 'endsWith':
+      return cellValue.endsWith(searchValue);
+    case 'equals':
+      return cellValue === searchValue;
+    case 'greaterThan':
+      return Number(row.getValue(condition.columnId)) > Number(condition.value);
+    case 'lessThan':
+      return Number(row.getValue(condition.columnId)) < Number(condition.value);
+    case 'notContains':
+      return !cellValue.includes(searchValue);
+    case 'startsWith':
+      return cellValue.startsWith(searchValue);
+    default:
+      return true;
+  }
+}

src/Griddy/features/advancedSearch/index.ts

@@ -0,0 +1,2 @@
+export { advancedSearchGlobalFilterFn, AdvancedSearchPanel } from './AdvancedSearchPanel';
+export type { AdvancedSearchState, BooleanOperator, SearchCondition } from './types';

src/Griddy/features/advancedSearch/types.ts

@@ -0,0 +1,20 @@
+export interface AdvancedSearchState {
+  booleanOperator: BooleanOperator;
+  conditions: SearchCondition[];
+}
+
+export type BooleanOperator = 'AND' | 'NOT' | 'OR';
+
+export interface SearchCondition {
+  columnId: string;
+  id: string;
+  operator:
+    | 'contains'
+    | 'endsWith'
+    | 'equals'
+    | 'greaterThan'
+    | 'lessThan'
+    | 'notContains'
+    | 'startsWith';
+  value: string;
+}

src/Griddy/features/columnVisibility/ColumnVisibilityMenu.tsx

@@ -0,0 +1,48 @@
+import type { Table } from '@tanstack/react-table'
+
+import { ActionIcon, Checkbox, Menu, Stack } from '@mantine/core'
+import { IconColumns } from '@tabler/icons-react'
+
+interface ColumnVisibilityMenuProps<T> {
+  table: Table<T>
+}
+
+export function ColumnVisibilityMenu<T>({ table }: ColumnVisibilityMenuProps<T>) {
+  const columns = table.getAllColumns().filter(col =>
+    col.id !== '_selection' && col.getCanHide()
+  )
+
+  if (columns.length === 0) {
+    return null
+  }
+
+  return (
+    <Menu position="bottom-end" shadow="md" width={200}>
+      <Menu.Target>
+        <ActionIcon aria-label="Toggle columns" size="sm" variant="subtle">
+          <IconColumns size={16} />
+        </ActionIcon>
+      </Menu.Target>
+
+      <Menu.Dropdown>
+        <Menu.Label>Toggle Columns</Menu.Label>
+        <Stack gap="xs" p="xs">
+          {columns.map(column => {
+            const header = column.columnDef.header
+            const label = typeof header === 'string' ? header : column.id
+
+            return (
+              <Checkbox
+                checked={column.getIsVisible()}
+                key={column.id}
+                label={label}
+                onChange={column.getToggleVisibilityHandler()}
+                size="xs"
+              />
+            )
+          })}
+        </Stack>
+      </Menu.Dropdown>
+    </Menu>
+  )
+}

src/Griddy/features/columnVisibility/index.ts

@@ -0,0 +1 @@
+export { ColumnVisibilityMenu } from './ColumnVisibilityMenu'

src/Griddy/features/errorBoundary/GriddyErrorBoundary.tsx

@@ -0,0 +1,58 @@
+import { Component, type ErrorInfo, type ReactNode } from 'react'
+
+import styles from '../../styles/griddy.module.css'
+
+interface ErrorBoundaryProps {
+  children: ReactNode
+  onError?: (error: Error) => void
+  onRetry?: () => void
+}
+
+interface ErrorBoundaryState {
+  error: Error | null
+}
+
+export class GriddyErrorBoundary extends Component<ErrorBoundaryProps, ErrorBoundaryState> {
+  state: ErrorBoundaryState = { error: null }
+
+  static getDerivedStateFromError(error: Error): ErrorBoundaryState {
+    return { error }
+  }
+
+  componentDidCatch(error: Error, info: ErrorInfo) {
+    this.props.onError?.(error)
+    console.error('[Griddy] Render error:', error, info)
+  }
+
+  handleRetry = () => {
+    this.props.onRetry?.()
+    // Defer clearing the error state to allow the parent's onRetry state update
+    // (e.g., resetting shouldError) to flush before we re-render children
+    setTimeout(() => this.setState({ error: null }), 0)
+  }
+
+  render() {
+    if (this.state.error) {
+      return (
+        <div className={styles['griddy-error']}>
+          <div className={styles['griddy-error-icon']}>!</div>
+          <div className={styles['griddy-error-message']}>
+            Something went wrong rendering the grid.
+          </div>
+          <div className={styles['griddy-error-detail']}>
+            {this.state.error.message}
+          </div>
+          <button
+            className={styles['griddy-error-retry']}
+            onClick={this.handleRetry}
+            type="button"
+          >
+            Retry
+          </button>
+        </div>
+      )
+    }
+
+    return this.props.children
+  }
+}

src/Griddy/features/errorBoundary/index.ts

@@ -0,0 +1 @@
+export { GriddyErrorBoundary } from './GriddyErrorBoundary'

src/Griddy/features/export/exportCsv.ts

@@ -0,0 +1,99 @@
+import type { Table } from '@tanstack/react-table'
+
+/**
+ * Export table data to CSV file
+ */
+export function exportToCsv<T>(table: Table<T>, filename: string = 'export.csv') {
+  const rows = table.getFilteredRowModel().rows
+  const columns = table.getVisibleLeafColumns().filter(col => col.id !== '_selection')
+
+  // Build CSV header
+  const headers = columns.map(col => {
+    const header = col.columnDef.header
+    return typeof header === 'string' ? header : col.id
+  })
+
+  // Build CSV rows
+  const csvRows = rows.map(row => {
+    return columns.map(col => {
+      const cell = row.getAllCells().find(c => c.column.id === col.id)
+      if (!cell) return ''
+
+      const value = cell.getValue()
+
+      // Handle different value types
+      if (value == null) return ''
+      if (typeof value === 'object' && value instanceof Date) {
+        return value.toISOString()
+      }
+
+      const stringValue = String(value)
+
+      // Escape quotes and wrap in quotes if needed
+      if (stringValue.includes(',') || stringValue.includes('"') || stringValue.includes('\n')) {
+        return `"${stringValue.replace(/"/g, '""')}"`
+      }
+
+      return stringValue
+    })
+  })
+
+  // Combine header and rows
+  const csv = [
+    headers.join(','),
+    ...csvRows.map(row => row.join(','))
+  ].join('\n')
+
+  // Create blob and download
+  const blob = new Blob([csv], { type: 'text/csv;charset=utf-8;' })
+  const link = document.createElement('a')
+  const url = URL.createObjectURL(blob)
+
+  link.setAttribute('href', url)
+  link.setAttribute('download', filename)
+  link.style.visibility = 'hidden'
+
+  document.body.appendChild(link)
+  link.click()
+  document.body.removeChild(link)
+
+  URL.revokeObjectURL(url)
+}
+
+/**
+ * Get CSV string without downloading
+ */
+export function getTableCsv<T>(table: Table<T>): string {
+  const rows = table.getFilteredRowModel().rows
+  const columns = table.getVisibleLeafColumns().filter(col => col.id !== '_selection')
+
+  const headers = columns.map(col => {
+    const header = col.columnDef.header
+    return typeof header === 'string' ? header : col.id
+  })
+
+  const csvRows = rows.map(row => {
+    return columns.map(col => {
+      const cell = row.getAllCells().find(c => c.column.id === col.id)
+      if (!cell) return ''
+
+      const value = cell.getValue()
+      if (value == null) return ''
+      if (typeof value === 'object' && value instanceof Date) {
+        return value.toISOString()
+      }
+
+      const stringValue = String(value)
+      if (stringValue.includes(',') || stringValue.includes('"') || stringValue.includes('\n')) {
+        return `"${stringValue.replace(/"/g, '""')}"`
+      }
+
+      return stringValue
+    })
+  })
+
+  return [
+    headers.join(','),
+    ...csvRows.map(row => row.join(','))
+  ].join('\n')
+}

src/Griddy/features/export/index.ts

@@ -0,0 +1 @@
+export { exportToCsv, getTableCsv } from './exportCsv'

src/Griddy/features/filterPresets/FilterPresetsMenu.tsx

@@ -0,0 +1,96 @@
+import type { Table } from '@tanstack/react-table'
+
+import { ActionIcon, Button, Group, Menu, Text, TextInput } from '@mantine/core'
+import { IconBookmark, IconTrash } from '@tabler/icons-react'
+import { useState } from 'react'
+
+import { useFilterPresets } from './useFilterPresets'
+
+interface FilterPresetsMenuProps {
+  persistenceKey?: string
+  table: Table<any>
+}
+
+export function FilterPresetsMenu({ persistenceKey, table }: FilterPresetsMenuProps) {
+  const { addPreset, deletePreset, presets } = useFilterPresets(persistenceKey)
+  const [newName, setNewName] = useState('')
+  const [opened, setOpened] = useState(false)
+
+  const handleSave = () => {
+    if (!newName.trim()) return
+    addPreset({
+      columnFilters: table.getState().columnFilters,
+      globalFilter: table.getState().globalFilter,
+      name: newName.trim(),
+    })
+    setNewName('')
+  }
+
+  const handleLoad = (preset: typeof presets[0]) => {
+    table.setColumnFilters(preset.columnFilters)
+    if (preset.globalFilter !== undefined) {
+      table.setGlobalFilter(preset.globalFilter)
+    }
+    setOpened(false)
+  }
+
+  return (
+    <Menu onChange={setOpened} opened={opened} position="bottom-end" withinPortal>
+      <Menu.Target>
+        <ActionIcon
+          aria-label="Filter presets"
+          size="sm"
+          variant="subtle"
+        >
+          <IconBookmark size={16} />
+        </ActionIcon>
+      </Menu.Target>
+      <Menu.Dropdown>
+        <Menu.Label>Saved Presets</Menu.Label>
+        {presets.length === 0 && (
+          <Menu.Item disabled>
+            <Text c="dimmed" size="xs">No presets saved</Text>
+          </Menu.Item>
+        )}
+        {presets.map((preset) => (
+          <Menu.Item
+            key={preset.id}
+            onClick={() => handleLoad(preset)}
+            rightSection={
+              <ActionIcon
+                color="red"
+                onClick={(e) => {
+                  e.stopPropagation()
+                  deletePreset(preset.id)
+                }}
+                size="xs"
+                variant="subtle"
+              >
+                <IconTrash size={12} />
+              </ActionIcon>
+            }
+          >
+            {preset.name}
+          </Menu.Item>
+        ))}
+        <Menu.Divider />
+        <Menu.Label>Save Current Filters</Menu.Label>
+        <div style={{ padding: '4px 12px 8px' }}>
+          <Group gap="xs">
+            <TextInput
+              onChange={(e) => setNewName(e.currentTarget.value)}
+              onKeyDown={(e) => e.key === 'Enter' && handleSave()}
+              placeholder="Preset name"
+              size="xs"
+              style={{ flex: 1 }}
+              value={newName}
+            />
+            <Button onClick={handleSave} size="xs">
+              Save
+            </Button>
+          </Group>
+        </div>
+      </Menu.Dropdown>
+    </Menu>
+  )
+}

src/Griddy/features/filterPresets/index.ts

@@ -0,0 +1,3 @@
+export { FilterPresetsMenu } from './FilterPresetsMenu'
+export type { FilterPreset } from './types'
+export { useFilterPresets } from './useFilterPresets'

src/Griddy/features/filterPresets/types.ts

@@ -0,0 +1,8 @@
+import type { ColumnFiltersState } from '@tanstack/react-table'
+
+export interface FilterPreset {
+  columnFilters: ColumnFiltersState
+  globalFilter?: string
+  id: string
+  name: string
+}

src/Griddy/features/filterPresets/useFilterPresets.ts

@@ -0,0 +1,49 @@
+import { useCallback, useState } from 'react';
+
+import type { FilterPreset } from './types';
+
+export function useFilterPresets(persistenceKey?: string) {
+  const key = persistenceKey ?? 'default';
+  const [presets, setPresets] = useState<FilterPreset[]>(() => loadPresets(key));
+
+  const addPreset = useCallback(
+    (preset: Omit<FilterPreset, 'id'>) => {
+      setPresets((prev) => {
+        const next = [...prev, { ...preset, id: String(Date.now()) }];
+        savePresets(key, next);
+        return next;
+      });
+    },
+    [key]
+  );
+
+  const deletePreset = useCallback(
+    (id: string) => {
+      setPresets((prev) => {
+        const next = prev.filter((p) => p.id !== id);
+        savePresets(key, next);
+        return next;
+      });
+    },
+    [key]
+  );
+
+  return { addPreset, deletePreset, presets };
+}
+
+function getStorageKey(persistenceKey: string) {
+  return `griddy-filter-presets-${persistenceKey}`;
+}
+
+function loadPresets(persistenceKey: string): FilterPreset[] {
+  try {
+    const raw = localStorage.getItem(getStorageKey(persistenceKey));
+    return raw ? JSON.parse(raw) : [];
+  } catch {
+    return [];
+  }
+}
+
+function savePresets(persistenceKey: string, presets: FilterPreset[]) {
+  localStorage.setItem(getStorageKey(persistenceKey), JSON.stringify(presets));
+}

src/Griddy/features/filtering/ColumnFilterButton.tsx

@@ -0,0 +1,37 @@
+import type { Column } from '@tanstack/react-table';
+import type React from 'react';
+
+import { ActionIcon } from '@mantine/core';
+import { IconFilter } from '@tabler/icons-react';
+import { forwardRef } from 'react';
+
+import { CSS } from '../../core/constants';
+import styles from '../../styles/griddy.module.css';
+
+interface ColumnFilterButtonProps {
+  column: Column<any, any>;
+  onClick?: (e: React.MouseEvent) => void;
+}
+
+export const ColumnFilterButton = forwardRef<HTMLButtonElement, ColumnFilterButtonProps>(
+  function ColumnFilterButton({ column, onClick, ...rest }, ref) {
+    const isActive = !!column.getFilterValue();
+
+    return (
+      <ActionIcon
+        {...rest}
+        aria-label="Open column filter"
+        className={[styles[CSS.filterButton], isActive ? styles[CSS.filterButtonActive] : '']
+          .filter(Boolean)
+          .join(' ')}
+        color={isActive ? 'blue' : 'gray'}
+        onClick={onClick}
+        ref={ref}
+        size="xs"
+        variant="subtle"
+      >
+        <IconFilter size={14} />
+      </ActionIcon>
+    );
+  }
+);

src/Griddy/features/filtering/ColumnFilterContextMenu.tsx

@@ -0,0 +1,105 @@
+import type { Column } from '@tanstack/react-table'
+
+import { Menu } from '@mantine/core'
+import { IconFilter, IconSortAscending, IconTrash } from '@tabler/icons-react'
+import { useState } from 'react'
+
+interface HeaderContextMenuProps {
+  children: React.ReactNode
+  column: Column<any, any>
+  onOpenFilter: () => void
+}
+
+export function HeaderContextMenu({
+  children,
+  column,
+  onOpenFilter,
+}: HeaderContextMenuProps) {
+  const [contextMenu, setContextMenu] = useState<{ x: number; y: number } | null>(null)
+
+  const handleContextMenu = (e: React.MouseEvent) => {
+    e.preventDefault()
+    setContextMenu({ x: e.clientX, y: e.clientY })
+  }
+
+  const handleSort = () => {
+    if (column.getCanSort()) {
+      const handler = column.getToggleSortingHandler()
+      if (handler) {
+        handler({} as any)
+      }
+    }
+    setContextMenu(null)
+  }
+
+  const handleClearSort = () => {
+    if (column.getCanSort()) {
+      const handler = column.getToggleSortingHandler()
+      if (handler) {
+        handler({} as any)
+      }
+    }
+    setContextMenu(null)
+  }
+
+  const handleResetFilter = () => {
+    if (column.getCanFilter()) {
+      column.setFilterValue(undefined)
+    }
+    setContextMenu(null)
+  }
+
+  const handleOpenFilter = () => {
+    if (column.getCanFilter()) {
+      onOpenFilter()
+    }
+    setContextMenu(null)
+  }
+
+  return (
+    <>
+      <div onContextMenu={handleContextMenu}>
+        {children}
+      </div>
+
+      {contextMenu && (
+        <Menu
+          closeOnClickOutside
+          closeOnEscape
+          onClose={() => setContextMenu(null)}
+          opened={true}
+          position="bottom-start"
+          withinPortal
+        >
+          <Menu.Dropdown style={{ left: contextMenu.x, position: 'fixed', top: contextMenu.y }}>
+            {column.getCanSort() && (
+              <>
+                <Menu.Item leftSection={<IconSortAscending size={14} />} onClick={handleSort}>
+                  Sort {column.getIsSorted() === 'asc' ? '↓' : '↑'}
+                </Menu.Item>
+                {column.getIsSorted() && (
+                  <Menu.Item leftSection={<IconTrash size={14} />} onClick={handleClearSort}>
+                    Reset Sorting
+                  </Menu.Item>
+                )}
+              </>
+            )}
+
+            {column.getCanFilter() && (
+              <>
+                {column.getFilterValue() && (
+                  <Menu.Item leftSection={<IconTrash size={14} />} onClick={handleResetFilter}>
+                    Reset Filter
+                  </Menu.Item>
+                )}
+                <Menu.Item leftSection={<IconFilter size={14} />} onClick={handleOpenFilter}>
+                  Open Filters
+                </Menu.Item>
+              </>
+            )}
+          </Menu.Dropdown>
+        </Menu>
+      )}
+    </>
+  )
+}

src/Griddy/features/filtering/ColumnFilterPopover.tsx

@@ -0,0 +1,145 @@
+import type { Column } from '@tanstack/react-table';
+import type React from 'react';
+
+import { Button, Group, Popover, Stack, Text } from '@mantine/core';
+import { useState } from 'react';
+
+import type { FilterConfig, FilterValue } from './types';
+
+import { getGriddyColumn } from '../../core/columnMapper';
+import { QuickFilterDropdown } from '../quickFilter';
+import { ColumnFilterButton } from './ColumnFilterButton';
+import { FilterBoolean } from './FilterBoolean';
+import { FilterDate } from './FilterDate';
+import { FilterInput } from './FilterInput';
+import { FilterSelect } from './FilterSelect';
+import { OPERATORS_BY_TYPE } from './operators';
+
+interface ColumnFilterPopoverProps {
+  column: Column<any, any>;
+  onOpenedChange?: (opened: boolean) => void;
+  opened?: boolean;
+}
+
+export function ColumnFilterPopover({
+  column,
+  onOpenedChange,
+  opened: externalOpened,
+}: ColumnFilterPopoverProps) {
+  const [internalOpened, setInternalOpened] = useState(false);
+
+  // Support both internal and external control
+  const opened = externalOpened !== undefined ? externalOpened : internalOpened;
+  const setOpened = (value: boolean) => {
+    if (externalOpened !== undefined) {
+      onOpenedChange?.(value);
+    } else {
+      setInternalOpened(value);
+    }
+  };
+  const [localValue, setLocalValue] = useState<FilterValue | undefined>(
+    (column.getFilterValue() as FilterValue) || undefined
+  );
+
+  const griddyColumn = getGriddyColumn(column);
+  const filterConfig: FilterConfig | undefined = (griddyColumn as any)?.filterConfig;
+
+  if (!filterConfig) {
+    return null;
+  }
+
+  const handleApply = () => {
+    column.setFilterValue(localValue);
+    setOpened(false);
+  };
+
+  const handleClear = () => {
+    setLocalValue(undefined);
+    column.setFilterValue(undefined);
+    setOpened(false);
+  };
+
+  const handleClose = () => {
+    setOpened(false);
+    // Reset to previous value if popover is closed without applying
+    setLocalValue((column.getFilterValue() as FilterValue) || undefined);
+  };
+
+  const operators = filterConfig.operators || OPERATORS_BY_TYPE[filterConfig.type];
+
+  const handleToggle = (e: React.MouseEvent) => {
+    e.stopPropagation();
+    setOpened(!opened);
+  };
+
+  return (
+    <Popover onClose={handleClose} opened={opened} position="bottom-start" withinPortal>
+      <Popover.Target>
+        <ColumnFilterButton column={column} onClick={handleToggle} />
+      </Popover.Target>
+      <Popover.Dropdown>
+        <Stack gap="sm" w={280}>
+          <Text fw={600} size="sm">
+            Filter: {column.id}
+          </Text>
+
+          {filterConfig.type === 'text' && (
+            <FilterInput
+              onChange={setLocalValue}
+              operators={operators}
+              type="text"
+              value={localValue}
+            />
+          )}
+
+          {filterConfig.type === 'number' && (
+            <FilterInput
+              onChange={setLocalValue}
+              operators={operators}
+              type="number"
+              value={localValue}
+            />
+          )}
+
+          {filterConfig.type === 'enum' && filterConfig.enumOptions && (
+            <FilterSelect
+              onChange={setLocalValue}
+              operators={operators}
+              options={filterConfig.enumOptions}
+              value={localValue}
+            />
+          )}
+
+          {filterConfig.type === 'boolean' && (
+            <FilterBoolean onChange={setLocalValue} value={localValue} />
+          )}
+
+          {filterConfig.type === 'date' && (
+            <FilterDate onChange={setLocalValue} operators={operators} value={localValue} />
+          )}
+
+          {filterConfig.quickFilter && (
+            <QuickFilterDropdown
+              column={column}
+              onApply={(val) => {
+                setLocalValue(val);
+                column.setFilterValue(val);
+                setOpened(false);
+              }}
+              value={localValue}
+            />
+          )}
+
+          <Group justify="flex-end">
+            <Button onClick={handleClear} size="xs" variant="subtle">
+              Clear
+            </Button>
+            <Button onClick={handleApply} size="xs">
+              Apply
+            </Button>
+          </Group>
+        </Stack>
+      </Popover.Dropdown>
+    </Popover>
+  );
+}

src/Griddy/features/filtering/FilterBoolean.tsx

@@ -0,0 +1,32 @@
+import { Radio, Stack } from '@mantine/core'
+import { useState } from 'react'
+
+import type { FilterValue } from './types'
+
+interface FilterBooleanProps {
+  onChange: (value: FilterValue) => void
+  value?: FilterValue
+}
+
+export function FilterBoolean({ onChange, value }: FilterBooleanProps) {
+  const [operator, setOperator] = useState<string>(value?.operator || 'isEmpty')
+
+  const handleChange = (op: string) => {
+    setOperator(op)
+    onChange({
+      operator: op,
+    })
+  }
+
+  return (
+    <Stack gap="xs" onClick={(e) => e.stopPropagation()}>
+      <Radio.Group label="Filter by" onChange={handleChange} value={operator}>
+        <Stack gap="xs">
+          <Radio label="True" value="isTrue" />
+          <Radio label="False" value="isFalse" />
+          <Radio label="All (no filter)" value="isEmpty" />
+        </Stack>
+      </Radio.Group>
+    </Stack>
+  )
+}

src/Griddy/features/filtering/FilterDate.tsx

@@ -0,0 +1,109 @@
+import { Group, Select, Stack } from '@mantine/core'
+import { DatePickerInput } from '@mantine/dates'
+import { useState } from 'react'
+
+import type { FilterOperator, FilterValue } from './types'
+
+interface FilterDateProps {
+  onChange: (value: FilterValue) => void
+  operators: FilterOperator[]
+  value?: FilterValue
+}
+
+export function FilterDate({ onChange, operators, value }: FilterDateProps) {
+  const [operator, setOperator] = useState<string>(value?.operator || operators[0]?.id || '')
+  const [startDate, setStartDate] = useState<Date | null>(() =>
+    value?.startDate ? new Date(value.startDate) : null
+  )
+  const [endDate, setEndDate] = useState<Date | null>(() =>
+    value?.endDate ? new Date(value.endDate) : null
+  )
+
+  const selectedOperator = operators.find((op) => op.id === operator)
+  const requiresValue = selectedOperator?.requiresValue !== false
+
+  const handleOperatorChange = (newOp: null | string) => {
+    if (newOp) {
+      setOperator(newOp)
+    }
+  }
+
+  // Handle "isBetween" operator specially
+  if (operator === 'isBetween') {
+    return (
+      <Stack gap="xs" onClick={(e) => e.stopPropagation()}>
+        <Select
+          data={operators.map((op) => ({ label: op.label, value: op.id }))}
+          label="Operator"
+          onChange={handleOperatorChange}
+          searchable
+          size="xs"
+          value={operator}
+        />
+        <Group grow>
+          <DatePickerInput
+            clearable
+            label="Start Date"
+            onChange={(date) => {
+              const dateValue = date ? (typeof date === 'string' ? new Date(date) : date) : null
+              setStartDate(dateValue)
+              onChange({
+                endDate: endDate ?? undefined,
+                operator: 'isBetween',
+                startDate: dateValue ?? undefined,
+              })
+            }}
+            placeholder="Start date"
+            size="xs"
+            value={startDate}
+          />
+          <DatePickerInput
+            clearable
+            label="End Date"
+            onChange={(date) => {
+              const dateValue = date ? (typeof date === 'string' ? new Date(date) : date) : null
+              setEndDate(dateValue)
+              onChange({
+                endDate: dateValue ?? undefined,
+                operator: 'isBetween',
+                startDate: startDate ?? undefined,
+              })
+            }}
+            placeholder="End date"
+            size="xs"
+            value={endDate}
+          />
+        </Group>
+      </Stack>
+    )
+  }
+
+  return (
+    <Stack gap="xs" onClick={(e) => e.stopPropagation()}>
+      <Select
+        data={operators.map((op) => ({ label: op.label, value: op.id }))}
+        label="Operator"
+        onChange={handleOperatorChange}
+        searchable
+        size="xs"
+        value={operator}
+      />
+      {requiresValue && (
+        <DatePickerInput
+          autoFocus
+          clearable
+          onChange={(date) => {
+            const dateValue = date ? (typeof date === 'string' ? new Date(date) : date) : null
+            onChange({
+              operator,
+              value: dateValue ?? undefined,
+            })
+          }}
+          placeholder="Select date..."
+          size="xs"
+          value={value?.value ? new Date(value.value) : null}
+        />
+      )}
+    </Stack>
+  )
+}

src/Griddy/features/filtering/FilterInput.tsx

@@ -0,0 +1,141 @@
+import { ActionIcon, Group, NumberInput, Select, Stack, TextInput } from '@mantine/core'
+import { IconX } from '@tabler/icons-react'
+import { useEffect, useRef, useState } from 'react'
+
+import type { FilterOperator, FilterValue } from './types'
+
+interface FilterInputProps {
+  onChange: (value: FilterValue) => void
+  operators: FilterOperator[]
+  type: 'number' | 'text'
+  value?: FilterValue
+}
+
+export function FilterInput({ onChange, operators, type, value }: FilterInputProps) {
+  const [operator, setOperator] = useState<string>(value?.operator || operators[0]?.id || '')
+  const [inputValue, setInputValue] = useState<number | string | undefined>(
+    value?.value !== undefined && value?.value !== null ? value.value : undefined,
+  )
+  const debounceTimerRef = useRef<NodeJS.Timeout | null>(null)
+
+  useEffect(() => {
+    // Clear previous timer
+    if (debounceTimerRef.current) {
+      clearTimeout(debounceTimerRef.current)
+    }
+
+    // For text inputs, debounce the changes
+    if (type === 'text' && inputValue !== undefined && inputValue !== '') {
+      debounceTimerRef.current = setTimeout(() => {
+        onChange({
+          operator,
+          value: inputValue,
+        })
+      }, 300)
+    }
+
+    return () => {
+      if (debounceTimerRef.current) {
+        clearTimeout(debounceTimerRef.current)
+      }
+    }
+  }, [inputValue, operator, onChange, type])
+
+  const selectedOperator = operators.find((op) => op.id === operator)
+  const requiresValue = selectedOperator?.requiresValue !== false
+
+  const handleClear = () => {
+    setInputValue(undefined)
+  }
+
+  const handleOperatorChange = (newOp: null | string) => {
+    if (newOp) {
+      setOperator(newOp)
+    }
+  }
+
+  // Handle "between" operator specially
+  if (operator === 'between' && type === 'number') {
+    const min = value?.min !== undefined ? Number(value.min) : undefined
+    const max = value?.max !== undefined ? Number(value.max) : undefined
+
+    return (
+      <Stack gap="xs" onClick={(e) => e.stopPropagation()}>
+        <Select
+          data={operators.map((op) => ({ label: op.label, value: op.id }))}
+          label="Operator"
+          onChange={handleOperatorChange}
+          searchable
+          size="xs"
+          value={operator}
+        />
+        <Group grow>
+          <NumberInput
+            label="Min"
+            onChange={(val) => {
+              onChange({
+                max: max === undefined ? undefined : Number(max),
+                min: val === undefined || val === null ? undefined : Number(val),
+                operator: 'between',
+              })
+            }}
+            placeholder="Minimum"
+            size="xs"
+            value={min}
+          />
+          <NumberInput
+            label="Max"
+            onChange={(val) => {
+              onChange({
+                max: val === undefined || val === null ? undefined : Number(val),
+                min: min === undefined ? undefined : Number(min),
+                operator: 'between',
+              })
+            }}
+            placeholder="Maximum"
+            size="xs"
+            value={max}
+          />
+        </Group>
+      </Stack>
+    )
+  }
+
+  return (
+    <Stack gap="xs" onClick={(e) => e.stopPropagation()}>
+      <Select
+        data={operators.map((op) => ({ label: op.label, value: op.id }))}
+        label="Operator"
+        onChange={handleOperatorChange}
+        searchable
+        size="xs"
+        value={operator}
+      />
+      {requiresValue && type === 'text' && (
+        <TextInput
+          autoFocus
+          onChange={(e) => setInputValue(e.currentTarget.value)}
+          placeholder="Enter value..."
+          rightSection={
+            inputValue && (
+              <ActionIcon color="gray" onClick={handleClear} size="xs" variant="subtle">
+                <IconX size={14} />
+              </ActionIcon>
+            )
+          }
+          size="xs"
+          value={inputValue === undefined ? '' : String(inputValue)}
+        />
+      )}
+      {requiresValue && type === 'number' && (
+        <NumberInput
+          autoFocus
+          onChange={(val) => setInputValue(val)}
+          placeholder="Enter number..."
+          size="xs"
+          value={inputValue as number | undefined}
+        />
+      )}
+    </Stack>
+  )
+}

src/Griddy/features/filtering/FilterSelect.tsx

@@ -0,0 +1,69 @@
+import { MultiSelect, Select, Stack } from '@mantine/core'
+import { useState } from 'react'
+
+import type { FilterEnumOption, FilterOperator, FilterValue } from './types'
+
+interface FilterSelectProps {
+  onChange: (value: FilterValue) => void
+  operators: FilterOperator[]
+  options: FilterEnumOption[]
+  value?: FilterValue
+}
+
+export function FilterSelect({ onChange, operators, options, value }: FilterSelectProps) {
+  const [operator, setOperator] = useState<string>(value?.operator || operators[0]?.id || 'includes')
+  const [selectedValues, setSelectedValues] = useState<string[]>(
+    value?.values?.map(String) || [],
+  )
+
+  const handleOperatorChange = (newOp: null | string) => {
+    if (newOp) {
+      setOperator(newOp)
+    }
+  }
+
+  const handleValuesChange = (vals: string[]) => {
+    setSelectedValues(vals)
+    if (operator !== 'isEmpty') {
+      onChange({
+        operator,
+        values: vals.map((v) => {
+          // Try to convert back to original value type
+          const option = options.find((opt) => String(opt.value) === v)
+          return option?.value ?? v
+        }),
+      })
+    }
+  }
+
+  const selectOptions = options.map((opt) => ({
+    label: opt.label,
+    value: String(opt.value),
+  }))
+
+  return (
+    <Stack gap="xs" onClick={(e) => e.stopPropagation()}>
+      <Select
+        data={operators.map((op) => ({ label: op.label, value: op.id }))}
+        label="Operator"
+        onChange={handleOperatorChange}
+        searchable
+        size="xs"
+        value={operator}
+      />
+      {operator !== 'isEmpty' && (
+        <MultiSelect
+          autoFocus
+          clearable
+          data={selectOptions}
+          label="Select values"
+          onChange={handleValuesChange}
+          placeholder="Choose values..."
+          searchable
+          size="xs"
+          value={selectedValues}
+        />
+      )}
+    </Stack>
+  )
+}

src/Griddy/features/filtering/filterFunctions.ts

@@ -0,0 +1,227 @@
+import type { FilterFn } from '@tanstack/react-table'
+
+import type { FilterValue } from './types'
+
+// ─── Text Filter Functions ──────────────────────────────────────────────────
+
+const textContains: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  return String(value).toLowerCase().includes(String(filterValue.value).toLowerCase())
+}
+
+const textEquals: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  return String(value).toLowerCase() === String(filterValue.value).toLowerCase()
+}
+
+const textStartsWith: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  return String(value).toLowerCase().startsWith(String(filterValue.value).toLowerCase())
+}
+
+const textEndsWith: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  return String(value).toLowerCase().endsWith(String(filterValue.value).toLowerCase())
+}
+
+const textNotContains: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return true
+  return !String(value).toLowerCase().includes(String(filterValue.value).toLowerCase())
+}
+
+const textIsEmpty: FilterFn<any> = (row: any, columnId: string) => {
+  const value = row.getValue(columnId)
+  return value == null || String(value).trim() === ''
+}
+
+const textIsNotEmpty: FilterFn<any> = (row: any, columnId: string) => {
+  const value = row.getValue(columnId)
+  return value != null && String(value).trim() !== ''
+}
+
+// ─── Number Filter Functions ────────────────────────────────────────────────
+
+const numberEquals: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  return Number(value) === Number(filterValue.value)
+}
+
+const numberNotEquals: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  return Number(value) !== Number(filterValue.value)
+}
+
+const numberGreaterThan: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  return Number(value) > Number(filterValue.value)
+}
+
+const numberGreaterThanOrEqual: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  return Number(value) >= Number(filterValue.value)
+}
+
+const numberLessThan: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  return Number(value) < Number(filterValue.value)
+}
+
+const numberLessThanOrEqual: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  return Number(value) <= Number(filterValue.value)
+}
+
+const numberBetween: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  const num = Number(value)
+  const min = filterValue.min != null ? Number(filterValue.min) : -Infinity
+  const max = filterValue.max != null ? Number(filterValue.max) : Infinity
+  return num >= min && num <= max
+}
+
+// ─── Enum Filter Functions ──────────────────────────────────────────────────
+
+const enumIncludes: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  const values = filterValue.values || []
+  return values.includes(value)
+}
+
+const enumExcludes: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return true
+  const values = filterValue.values || []
+  return !values.includes(value)
+}
+
+// ─── Boolean Filter Functions ───────────────────────────────────────────────
+
+const booleanIsTrue: FilterFn<any> = (row: any, columnId: string) => {
+  const value = row.getValue(columnId)
+  return value === true || value === 1 || String(value).toLowerCase() === 'true'
+}
+
+const booleanIsFalse: FilterFn<any> = (row: any, columnId: string) => {
+  const value = row.getValue(columnId)
+  return value === false || value === 0 || String(value).toLowerCase() === 'false'
+}
+
+// ─── Date Filter Functions ──────────────────────────────────────────────────
+
+const dateIs: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null || filterValue.value == null) return false
+  const rowDate = new Date(value)
+  const filterDate = new Date(filterValue.value)
+  return rowDate.toDateString() === filterDate.toDateString()
+}
+
+const dateIsBefore: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null || filterValue.value == null) return false
+  const rowDate = new Date(value)
+  const filterDate = new Date(filterValue.value)
+  return rowDate < filterDate
+}
+
+const dateIsAfter: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null || filterValue.value == null) return false
+  const rowDate = new Date(value)
+  const filterDate = new Date(filterValue.value)
+  return rowDate > filterDate
+}
+
+const dateIsBetween: FilterFn<any> = (row: any, columnId: string, filterValue: FilterValue) => {
+  const value = row.getValue(columnId)
+  if (value == null) return false
+  const rowDate = new Date(value)
+  const startDate = filterValue.startDate ? new Date(filterValue.startDate) : null
+  const endDate = filterValue.endDate ? new Date(filterValue.endDate) : null
+  if (startDate && endDate) {
+    return rowDate >= startDate && rowDate <= endDate
+  }
+  if (startDate) {
+    return rowDate >= startDate
+  }
+  if (endDate) {
+    return rowDate <= endDate
+  }
+  return true
+}
+
+// ─── Filter Function Map ────────────────────────────────────────────────────
+
+const FILTER_FN_MAP: Record<string, FilterFn<any>> = {
+  between: numberBetween,
+  contains: textContains,
+  endsWith: textEndsWith,
+  enumExcludes,
+  enumIncludes,
+  equals: ((row: any, columnId: string, filterValue: FilterValue, addMeta: any) => {
+    const value = row.getValue(columnId)
+    // Detect type and use appropriate equals function
+    if (typeof value === 'number') {
+      return numberEquals(row, columnId, filterValue, addMeta)
+    }
+    return textEquals(row, columnId, filterValue, addMeta)
+  }) as FilterFn<any>,
+  excludes: enumExcludes,
+  greaterThan: numberGreaterThan,
+  greaterThanOrEqual: numberGreaterThanOrEqual,
+  includes: enumIncludes,
+  is: dateIs,
+  isAfter: dateIsAfter,
+  isBefore: dateIsBefore,
+  isBetween: dateIsBetween,
+  isEmpty: (
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    (row: any, columnId: string, _filterValue: any, _addMeta: any) => {
+      const value = row.getValue(columnId)
+      return value == null || value === '' || (Array.isArray(value) && value.length === 0)
+    }
+  ) as FilterFn<any>,
+  isFalse: booleanIsFalse,
+  isNotEmpty: (
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    (row: any, columnId: string, _filterValue: any, _addMeta: any) => {
+      const value = row.getValue(columnId)
+      return value != null && value !== '' && (!Array.isArray(value) || value.length > 0)
+    }
+  ) as FilterFn<any>,
+  isTrue: booleanIsTrue,
+  lessThan: numberLessThan,
+  lessThanOrEqual: numberLessThanOrEqual,
+  notContains: textNotContains,
+  notEquals: numberNotEquals,
+  startsWith: textStartsWith,
+  textIsEmpty,
+  textIsNotEmpty,
+}
+
+// ─── Universal Filter Function ──────────────────────────────────────────────
+
+export function createOperatorFilter(): FilterFn<any> {
+  return (row: any, columnId: string, filterValue: FilterValue, addMeta: any) => {
+    if (!filterValue?.operator) return true
+    const filterFn = FILTER_FN_MAP[filterValue.operator]
+    if (!filterFn) {
+      console.warn(`Unknown filter operator: ${filterValue.operator}`)
+      return true
+    }
+    return filterFn(row, columnId, filterValue, addMeta)
+  }
+}

src/Griddy/features/filtering/index.ts

@@ -0,0 +1,10 @@
+export { ColumnFilterButton } from './ColumnFilterButton'
+export { HeaderContextMenu } from './ColumnFilterContextMenu'
+export { ColumnFilterPopover } from './ColumnFilterPopover'
+export { FilterBoolean } from './FilterBoolean'
+export { FilterDate } from './FilterDate'
+export { createOperatorFilter } from './filterFunctions'
+export { FilterInput } from './FilterInput'
+export { FilterSelect } from './FilterSelect'
+export { BOOLEAN_OPERATORS, DATE_OPERATORS, ENUM_OPERATORS, NUMBER_OPERATORS, OPERATORS_BY_TYPE, TEXT_OPERATORS } from './operators'
+export type { FilterConfig, FilterEnumOption, FilterOperator, FilterState, FilterValue } from './types'

src/Griddy/features/filtering/operators.ts

@@ -0,0 +1,63 @@
+import type { FilterOperator } from './types'
+
+// ─── Text Operators ─────────────────────────────────────────────────────────
+
+export const TEXT_OPERATORS: FilterOperator[] = [
+  { id: 'contains', label: 'Contains' },
+  { id: 'equals', label: 'Equals' },
+  { id: 'startsWith', label: 'Starts with' },
+  { id: 'endsWith', label: 'Ends with' },
+  { id: 'notContains', label: 'Does not contain' },
+  { id: 'isEmpty', label: 'Is empty', requiresValue: false },
+  { id: 'isNotEmpty', label: 'Is not empty', requiresValue: false },
+]
+
+// ─── Number Operators ───────────────────────────────────────────────────────
+
+export const NUMBER_OPERATORS: FilterOperator[] = [
+  { id: 'equals', label: 'Equals (=)' },
+  { id: 'notEquals', label: 'Not equals (≠)' },
+  { id: 'greaterThan', label: 'Greater than (>)' },
+  { id: 'greaterThanOrEqual', label: 'Greater or equal (≥)' },
+  { id: 'lessThan', label: 'Less than (<)' },
+  { id: 'lessThanOrEqual', label: 'Less or equal (≤)' },
+  { id: 'between', label: 'Between' },
+  { id: 'isEmpty', label: 'Is empty', requiresValue: false },
+]
+
+// ─── Enum Operators ─────────────────────────────────────────────────────────
+
+export const ENUM_OPERATORS: FilterOperator[] = [
+  { id: 'includes', label: 'Includes' },
+  { id: 'excludes', label: 'Excludes' },
+  { id: 'isEmpty', label: 'Is empty', requiresValue: false },
+]
+
+// ─── Boolean Operators ──────────────────────────────────────────────────────
+
+export const BOOLEAN_OPERATORS: FilterOperator[] = [
+  { id: 'isTrue', label: 'True' },
+  { id: 'isFalse', label: 'False' },
+  { id: 'isEmpty', label: 'All', requiresValue: false },
+]
+
+// ─── Date Operators ─────────────────────────────────────────────────────────
+
+export const DATE_OPERATORS: FilterOperator[] = [
+  { id: 'is', label: 'Is' },
+  { id: 'isBefore', label: 'Is before' },
+  { id: 'isAfter', label: 'Is after' },
+  { id: 'isBetween', label: 'Is between' },
+  { id: 'isEmpty', label: 'Is empty', requiresValue: false },
+  { id: 'isNotEmpty', label: 'Is not empty', requiresValue: false },
+]
+
+// ─── Operator Maps ──────────────────────────────────────────────────────────
+
+export const OPERATORS_BY_TYPE = {
+  boolean: BOOLEAN_OPERATORS,
+  date: DATE_OPERATORS,
+  enum: ENUM_OPERATORS,
+  number: NUMBER_OPERATORS,
+  text: TEXT_OPERATORS,
+} as const

src/Griddy/features/filtering/types.ts

@@ -0,0 +1,37 @@
+// ─── Filter Types ───────────────────────────────────────────────────────────
+
+export interface FilterConfig {
+  enumOptions?: FilterEnumOption[]
+  operators?: FilterOperator[]
+  /** Enable quick filter (checkbox list of unique values) in the filter popover */
+  quickFilter?: boolean
+  type: 'boolean' | 'date' | 'enum' | 'number' | 'text'
+}
+
+export interface FilterEnumOption {
+  label: string
+  value: any
+}
+
+export interface FilterOperator {
+  id: string
+  label: string
+  requiresValue?: boolean
+}
+
+// ─── Filter Value Structure ─────────────────────────────────────────────────
+
+export interface FilterState {
+  id: string
+  value: FilterValue
+}
+
+export interface FilterValue {
+  endDate?: Date
+  max?: number
+  min?: number
+  operator: string
+  startDate?: Date
+  value?: any
+  values?: any[]
+}

src/Griddy/features/keyboard/useKeyboardNavigation.ts

@@ -0,0 +1,309 @@
+import type { Table } from '@tanstack/react-table'
+import type { Virtualizer } from '@tanstack/react-virtual'
+
+import { type RefObject, useCallback, useEffect, useRef } from 'react'
+
+import type { GriddyUIState, SearchConfig, SelectionConfig, TreeConfig } from '../../core/types'
+
+interface UseKeyboardNavigationOptions<TData = unknown> {
+  editingEnabled: boolean
+  scrollRef: RefObject<HTMLDivElement | null>
+  search?: SearchConfig
+  selection?: SelectionConfig
+  storeState: GriddyUIState
+  table: Table<TData>
+  tree?: TreeConfig<TData>
+  virtualizer: Virtualizer<HTMLDivElement, Element>
+}
+
+export function useKeyboardNavigation<TData = unknown>({
+  editingEnabled,
+  scrollRef,
+  search,
+  selection,
+  storeState,
+  table,
+  tree,
+  virtualizer,
+}: UseKeyboardNavigationOptions<TData>) {
+  // Keep a ref to the latest store state so the keydown handler always sees fresh state
+  const stateRef = useRef(storeState)
+  stateRef.current = storeState
+
+  const handleKeyDown = useCallback((e: KeyboardEvent) => {
+    const state = stateRef.current
+    const { focusedRowIndex, isEditing, isSearchOpen } = state
+    const rowCount = table.getRowModel().rows.length
+    const visibleCount = virtualizer.getVirtualItems().length
+    const selectionMode = selection?.mode ?? 'none'
+    const multiSelect = selection?.mode === 'multi'
+
+    // ─── Search mode: only Escape exits ───
+    if (isSearchOpen) {
+      if (e.key === 'Escape') {
+        state.setSearchOpen(false)
+        e.preventDefault()
+      }
+      return
+    }
+
+    // ─── Edit mode: only Escape exits at grid level ───
+    if (isEditing) {
+      if (e.key === 'Escape') {
+        state.setEditing(false)
+        e.preventDefault()
+      }
+      return
+    }
+
+    // ─── Normal mode ───
+    const ctrl = e.ctrlKey || e.metaKey
+    const shift = e.shiftKey
+
+    // Handle shift+arrow before plain arrow
+    if (shift && !ctrl) {
+      if (e.key === 'ArrowDown' && multiSelect && focusedRowIndex !== null) {
+        e.preventDefault()
+        const nextIdx = Math.min(focusedRowIndex + 1, rowCount - 1)
+        const row = table.getRowModel().rows[nextIdx]
+        row?.toggleSelected(true)
+        state.moveFocus('down', 1)
+        virtualizer.scrollToIndex(Math.min(focusedRowIndex + 1, rowCount - 1), { align: 'auto' })
+        return
+      }
+      if (e.key === 'ArrowUp' && multiSelect && focusedRowIndex !== null) {
+        e.preventDefault()
+        const prevIdx = Math.max(focusedRowIndex - 1, 0)
+        const row = table.getRowModel().rows[prevIdx]
+        row?.toggleSelected(true)
+        state.moveFocus('up', 1)
+        virtualizer.scrollToIndex(Math.max(focusedRowIndex - 1, 0), { align: 'auto' })
+        return
+      }
+    }
+
+    let didNavigate: boolean
+
+    switch (e.key) {
+      case ' ': {
+        if (selectionMode !== 'none' && focusedRowIndex !== null) {
+          e.preventDefault()
+          const row = table.getRowModel().rows[focusedRowIndex]
+          if (row) {
+            if (selectionMode === 'single') {
+              table.resetRowSelection()
+              row.toggleSelected(true)
+            } else {
+              row.toggleSelected()
+            }
+          }
+        }
+        return
+      }
+
+      case 'a': {
+        if (ctrl && multiSelect) {
+          e.preventDefault()
+          table.toggleAllRowsSelected()
+        }
+        return
+      }
+
+      case 'ArrowDown': {
+        e.preventDefault()
+        state.moveFocus('down', 1)
+        didNavigate = true
+        break
+      }
+
+      case 'ArrowLeft': {
+        // Tree navigation: collapse or move to parent
+        if (tree?.enabled && focusedRowIndex !== null) {
+          e.preventDefault()
+          const row = table.getRowModel().rows[focusedRowIndex]
+          if (row) {
+            if (row.getIsExpanded()) {
+              // Collapse if expanded
+              row.toggleExpanded(false)
+            } else if (row.depth > 0) {
+              // Move to parent if not expanded
+              const parent = findParentRow(table.getRowModel().rows, row)
+              if (parent) {
+                const parentIndex = table.getRowModel().rows.findIndex((r) => r.id === parent.id)
+                if (parentIndex !== -1) {
+                  state.setFocusedRow(parentIndex)
+                  virtualizer.scrollToIndex(parentIndex, { align: 'auto' })
+                }
+              }
+            }
+          }
+        }
+        return
+      }
+
+      case 'ArrowRight': {
+        // Tree navigation: expand or move to first child
+        if (tree?.enabled && focusedRowIndex !== null) {
+          e.preventDefault()
+          const row = table.getRowModel().rows[focusedRowIndex]
+          if (row) {
+            if (row.getCanExpand() && !row.getIsExpanded()) {
+              // Expand if can expand and not already expanded
+              row.toggleExpanded(true)
+            } else if (row.getIsExpanded() && row.subRows.length > 0) {
+              // Move to first child if expanded
+              const nextIdx = focusedRowIndex + 1
+              if (nextIdx < rowCount) {
+                const nextRow = table.getRowModel().rows[nextIdx]
+                // Verify it's actually a child (depth increased)
+                if (nextRow && nextRow.depth > row.depth) {
+                  state.setFocusedRow(nextIdx)
+                  virtualizer.scrollToIndex(nextIdx, { align: 'auto' })
+                }
+              }
+            }
+          }
+        }
+        return
+      }
+
+      case 'ArrowUp': {
+        e.preventDefault()
+        state.moveFocus('up', 1)
+        didNavigate = true
+        break
+      }
+
+      case 'e': {
+        if (ctrl && editingEnabled && focusedRowIndex !== null) {
+          e.preventDefault()
+          // Find first editable column
+          const columns = table.getAllColumns().filter(col => col.id !== '_selection')
+          const firstEditableCol = columns.find(col => {
+            const meta = col.columnDef.meta as any
+            return meta?.griddy?.editable === true
+          })
+          if (firstEditableCol) {
+            state.setFocusedColumn(firstEditableCol.id)
+          }
+          state.setEditing(true)
+        }
+        return
+      }
+
+      case 'End': {
+        e.preventDefault()
+        state.moveFocusToEnd()
+        didNavigate = true
+        break
+      }
+
+      case 'Enter': {
+        if (editingEnabled && focusedRowIndex !== null && !ctrl) {
+          e.preventDefault()
+          // Find first editable column
+          const columns = table.getAllColumns().filter(col => col.id !== '_selection')
+          const firstEditableCol = columns.find(col => {
+            const meta = col.columnDef.meta as any
+            return meta?.griddy?.editable === true
+          })
+          if (firstEditableCol) {
+            state.setFocusedColumn(firstEditableCol.id)
+          }
+          state.setEditing(true)
+        }
+        return
+      }
+
+      case 'Escape': {
+        if (state.isSelecting) {
+          state.setSelecting(false)
+          e.preventDefault()
+        } else if (selectionMode !== 'none') {
+          table.resetRowSelection()
+          e.preventDefault()
+        }
+        return
+      }
+
+      case 'f': {
+        if (ctrl && search?.enabled) {
+          e.preventDefault()
+          state.setSearchOpen(true)
+        }
+        return
+      }
+
+      case 'Home': {
+        e.preventDefault()
+        state.moveFocusToStart()
+        didNavigate = true
+        break
+      }
+
+      case 'PageDown': {
+        e.preventDefault()
+        state.moveFocus('down', visibleCount)
+        didNavigate = true
+        break
+      }
+
+      case 'PageUp': {
+        e.preventDefault()
+        state.moveFocus('up', visibleCount)
+        didNavigate = true
+        break
+      }
+
+      case 's': {
+        if (ctrl && selectionMode !== 'none') {
+          e.preventDefault()
+          state.setSelecting(!state.isSelecting)
+        }
+        return
+      }
+
+      default:
+        return
+    }
+
+    // Auto-scroll after navigation keys
+    if (didNavigate && focusedRowIndex !== null) {
+      // Estimate the new position based on the action
+      const newIndex = Math.max(0, Math.min(
+        e.key === 'Home' ? 0 :
+        e.key === 'End' ? rowCount - 1 :
+        e.key === 'PageDown' ? focusedRowIndex + visibleCount :
+        e.key === 'PageUp' ? focusedRowIndex - visibleCount :
+        e.key === 'ArrowDown' ? focusedRowIndex + 1 :
+        focusedRowIndex - 1,
+        rowCount - 1,
+      ))
+      virtualizer.scrollToIndex(newIndex, { align: 'auto' })
+    }
+  }, [table, virtualizer, selection, search, editingEnabled, tree])
+
+  useEffect(() => {
+    const el = scrollRef.current
+    if (!el) return
+    el.addEventListener('keydown', handleKeyDown)
+    return () => el.removeEventListener('keydown', handleKeyDown)
+  }, [handleKeyDown, scrollRef])
+}
+
+/**
+ * Helper to find parent row in tree structure
+ */
+function findParentRow<TData>(rows: any[], childRow: any): any | null {
+  const childIndex = rows.findIndex((r) => r.id === childRow.id);
+  if (childIndex === -1) return null;
+
+  const targetDepth = childRow.depth - 1;
+  // Search backwards from child position
+  for (let i = childIndex - 1; i >= 0; i--) {
+    if (rows[i].depth === targetDepth) {
+      return rows[i];
+    }
+  }
+  return null;
+}

src/Griddy/features/loading/GriddyLoadingSkeleton.tsx

@@ -0,0 +1,37 @@
+import type { GriddyColumn } from '../../core/types';
+
+import { DEFAULTS } from '../../core/constants';
+import { useGriddyStore } from '../../core/GriddyStore';
+import styles from '../../styles/griddy.module.css';
+
+export function GriddyLoadingOverlay() {
+  return (
+    <div className={styles['griddy-loading-overlay']}>
+      <div className={styles['griddy-loading-spinner']}>Loading...</div>
+    </div>
+  );
+}
+
+export function GriddyLoadingSkeleton() {
+  const columns = useGriddyStore((s) => s.columns);
+  const rowHeight = useGriddyStore((s) => s.rowHeight) ?? DEFAULTS.rowHeight;
+  const skeletonRowCount = 8;
+
+  return (
+    <div className={styles['griddy-skeleton']}>
+      {Array.from({ length: skeletonRowCount }, (_, rowIndex) => (
+        <div className={styles['griddy-skeleton-row']} key={rowIndex} style={{ height: rowHeight }}>
+          {(columns ?? []).map((col: GriddyColumn<any>) => (
+            <div
+              className={styles['griddy-skeleton-cell']}
+              key={col.id}
+              style={{ width: col.width ?? 150 }}
+            >
+              <div className={styles['griddy-skeleton-bar']} />
+            </div>
+          ))}
+        </div>
+      ))}
+    </div>
+  );
+}

src/Griddy/features/loading/index.ts

@@ -0,0 +1 @@
+export { GriddyLoadingOverlay, GriddyLoadingSkeleton } from './GriddyLoadingSkeleton'

src/Griddy/features/pagination/PaginationControl.tsx

@@ -0,0 +1,81 @@
+import type { Table } from '@tanstack/react-table'
+
+import { ActionIcon, Group, Select, Text } from '@mantine/core'
+import { IconChevronLeft, IconChevronRight, IconChevronsLeft, IconChevronsRight } from '@tabler/icons-react'
+
+import styles from '../../styles/griddy.module.css'
+
+interface PaginationControlProps<T> {
+  pageSizeOptions?: number[]
+  table: Table<T>
+}
+
+export function PaginationControl<T>({ pageSizeOptions = [10, 25, 50, 100], table }: PaginationControlProps<T>) {
+  const pageIndex = table.getState().pagination.pageIndex
+  const pageSize = table.getState().pagination.pageSize
+  const pageCount = table.getPageCount()
+  const canPreviousPage = table.getCanPreviousPage()
+  const canNextPage = table.getCanNextPage()
+
+  return (
+    <Group className={styles['griddy-pagination']} gap="md" justify="space-between" p="xs">
+      <Group gap="xs">
+        <Text c="dimmed" size="sm">
+          Page {pageIndex + 1} of {pageCount}
+        </Text>
+      </Group>
+
+      <Group gap="xs">
+        <ActionIcon
+          disabled={!canPreviousPage}
+          onClick={() => table.setPageIndex(0)}
+          size="sm"
+          variant="subtle"
+        >
+          <IconChevronsLeft size={16} />
+        </ActionIcon>
+        <ActionIcon
+          disabled={!canPreviousPage}
+          onClick={() => table.previousPage()}
+          size="sm"
+          variant="subtle"
+        >
+          <IconChevronLeft size={16} />
+        </ActionIcon>
+        <ActionIcon
+          disabled={!canNextPage}
+          onClick={() => table.nextPage()}
+          size="sm"
+          variant="subtle"
+        >
+          <IconChevronRight size={16} />
+        </ActionIcon>
+        <ActionIcon
+          disabled={!canNextPage}
+          onClick={() => table.setPageIndex(pageCount - 1)}
+          size="sm"
+          variant="subtle"
+        >
+          <IconChevronsRight size={16} />
+        </ActionIcon>
+      </Group>
+
+      <Group gap="xs">
+        <Text c="dimmed" size="sm">
+          Rows per page:
+        </Text>
+        <Select
+          data={pageSizeOptions.map(size => ({ label: String(size), value: String(size) }))}
+          onChange={(value) => {
+            if (value) {
+              table.setPageSize(Number(value))
+            }
+          }}
+          size="xs"
+          value={String(pageSize)}
+          w={70}
+        />
+      </Group>
+    </Group>
+  )
+}

src/Griddy/features/pagination/index.ts

@@ -0,0 +1 @@
+export { PaginationControl } from './PaginationControl'

src/Griddy/features/quickFilter/QuickFilterDropdown.tsx

@@ -0,0 +1,81 @@
+import type { Column } from '@tanstack/react-table'
+
+import { Checkbox, ScrollArea, Stack, Text, TextInput } from '@mantine/core'
+import { useMemo, useState } from 'react'
+
+import type { FilterValue } from '../filtering/types'
+
+import { useGriddyStore } from '../../core/GriddyStore'
+import styles from '../../styles/griddy.module.css'
+
+interface QuickFilterDropdownProps {
+  column: Column<any, any>
+  onApply: (value: FilterValue | undefined) => void
+  value?: FilterValue
+}
+
+export function QuickFilterDropdown({ column, onApply, value }: QuickFilterDropdownProps) {
+  const data = useGriddyStore((s) => s.data) ?? []
+  const [searchTerm, setSearchTerm] = useState('')
+
+  const uniqueValues = useMemo(() => {
+    const seen = new Set<string>()
+    for (const row of data) {
+      const accessorFn = (column.columnDef as any).accessorFn
+      const cellValue = accessorFn
+        ? accessorFn(row, 0)
+        : (row as any)[column.id]
+      const str = String(cellValue ?? '')
+      if (str) seen.add(str)
+    }
+    return Array.from(seen).sort()
+  }, [data, column])
+
+  const selectedValues = new Set<string>(value?.values ?? [])
+
+  const filtered = searchTerm
+    ? uniqueValues.filter((v) => v.toLowerCase().includes(searchTerm.toLowerCase()))
+    : uniqueValues
+
+  const handleToggle = (val: string) => {
+    const next = new Set(selectedValues)
+    if (next.has(val)) {
+      next.delete(val)
+    } else {
+      next.add(val)
+    }
+    if (next.size === 0) {
+      onApply(undefined)
+    } else {
+      onApply({ operator: 'includes', values: Array.from(next) })
+    }
+  }
+
+  return (
+    <Stack className={styles['griddy-quick-filter']} gap="xs">
+      <Text fw={600} size="xs">Quick Filter</Text>
+      <TextInput
+        onChange={(e) => setSearchTerm(e.currentTarget.value)}
+        placeholder="Search values..."
+        size="xs"
+        value={searchTerm}
+      />
+      <ScrollArea.Autosize mah={200}>
+        <Stack gap={4}>
+          {filtered.map((val) => (
+            <Checkbox
+              checked={selectedValues.has(val)}
+              key={val}
+              label={val}
+              onChange={() => handleToggle(val)}
+              size="xs"
+            />
+          ))}
+          {filtered.length === 0 && (
+            <Text c="dimmed" size="xs">No values found</Text>
+          )}
+        </Stack>
+      </ScrollArea.Autosize>
+    </Stack>
+  )
+}

src/Griddy/features/quickFilter/index.ts

@@ -0,0 +1 @@
+export { QuickFilterDropdown } from './QuickFilterDropdown'

src/Griddy/features/renderers/BadgeRenderer.tsx

@@ -0,0 +1,24 @@
+import type { RendererProps } from '../../core/types'
+
+import styles from '../../styles/griddy.module.css'
+
+interface BadgeMeta {
+  colorMap?: Record<string, string>
+  defaultColor?: string
+}
+
+export function BadgeRenderer<T>({ column, value }: RendererProps<T>) {
+  const meta = column.rendererMeta as BadgeMeta | undefined
+  const text = String(value ?? '')
+  const colorMap = meta?.colorMap ?? {}
+  const color = colorMap[text] ?? meta?.defaultColor ?? '#868e96'
+
+  return (
+    <span
+      className={styles['griddy-renderer-badge']}
+      style={{ background: color }}
+    >
+      {text}
+    </span>
+  )
+}

src/Griddy/features/renderers/ImageRenderer.tsx

@@ -0,0 +1,27 @@
+import type { RendererProps } from '../../core/types'
+
+import styles from '../../styles/griddy.module.css'
+
+interface ImageMeta {
+  alt?: string
+  height?: number
+  width?: number
+}
+
+export function ImageRenderer<T>({ column, value }: RendererProps<T>) {
+  const meta = column.rendererMeta as ImageMeta | undefined
+  const src = String(value ?? '')
+  const size = meta?.height ?? 28
+
+  if (!src) return null
+
+  return (
+    <img
+      alt={meta?.alt ?? ''}
+      className={styles['griddy-renderer-image']}
+      height={meta?.height ?? size}
+      src={src}
+      width={meta?.width ?? size}
+    />
+  )
+}

src/Griddy/features/renderers/ProgressBarRenderer.tsx

@@ -0,0 +1,32 @@
+import type { RendererProps } from '../../core/types'
+
+import styles from '../../styles/griddy.module.css'
+
+interface ProgressBarMeta {
+  color?: string
+  max?: number
+  showLabel?: boolean
+}
+
+export function ProgressBarRenderer<T>({ column, value }: RendererProps<T>) {
+  const meta = column.rendererMeta as ProgressBarMeta | undefined
+  const max = meta?.max ?? 100
+  const color = meta?.color ?? '#228be6'
+  const showLabel = meta?.showLabel !== false
+  const numValue = Number(value) || 0
+  const pct = Math.min(100, Math.max(0, (numValue / max) * 100))
+
+  return (
+    <div className={styles['griddy-renderer-progress']}>
+      <div
+        className={styles['griddy-renderer-progress-bar']}
+        style={{ background: color, width: `${pct}%` }}
+      />
+      {showLabel && (
+        <span className={styles['griddy-renderer-progress-label']}>
+          {Math.round(pct)}%
+        </span>
+      )}
+    </div>
+  )
+}

src/Griddy/features/renderers/SparklineRenderer.tsx

@@ -0,0 +1,45 @@
+import type { RendererProps } from '../../core/types'
+
+import styles from '../../styles/griddy.module.css'
+
+interface SparklineMeta {
+  color?: string
+  height?: number
+  width?: number
+}
+
+export function SparklineRenderer<T>({ column, value }: RendererProps<T>) {
+  const meta = column.rendererMeta as SparklineMeta | undefined
+  const data = Array.isArray(value) ? value.map(Number) : []
+  const w = meta?.width ?? 80
+  const h = meta?.height ?? 24
+  const color = meta?.color ?? '#228be6'
+
+  if (data.length < 2) return null
+
+  const min = Math.min(...data)
+  const max = Math.max(...data)
+  const range = max - min || 1
+  const stepX = w / (data.length - 1)
+
+  const points = data
+    .map((v, i) => `${i * stepX},${h - ((v - min) / range) * h}`)
+    .join(' ')
+
+  return (
+    <svg
+      className={styles['griddy-renderer-sparkline']}
+      height={h}
+      viewBox={`0 0 ${w} ${h}`}
+      width={w}
+    >
+      <polyline
+        fill="none"
+        points={points}
+        stroke={color}
+        strokeLinejoin="round"
+        strokeWidth="1.5"
+      />
+    </svg>
+  )
+}

src/Griddy/features/renderers/index.ts

@@ -0,0 +1,4 @@
+export { BadgeRenderer } from './BadgeRenderer'
+export { ImageRenderer } from './ImageRenderer'
+export { ProgressBarRenderer } from './ProgressBarRenderer'
+export { SparklineRenderer } from './SparklineRenderer'

src/Griddy/features/search/SearchOverlay.tsx

@@ -0,0 +1,111 @@
+import { ActionIcon, Group, TextInput } from '@mantine/core'
+import { IconX } from '@tabler/icons-react'
+import { useCallback, useEffect, useRef, useState } from 'react'
+
+import { CSS, DEFAULTS } from '../../core/constants'
+import { useGriddyStore } from '../../core/GriddyStore'
+import styles from '../../styles/griddy.module.css'
+import { SearchHistoryDropdown, useSearchHistory } from '../searchHistory'
+
+export function SearchOverlay() {
+  const table = useGriddyStore((s) => s._table)
+  const isSearchOpen = useGriddyStore((s) => s.isSearchOpen)
+  const setSearchOpen = useGriddyStore((s) => s.setSearchOpen)
+  const search = useGriddyStore((s) => s.search)
+  const persistenceKey = useGriddyStore((s) => s.persistenceKey)
+
+  const [query, setQuery] = useState('')
+  const [showHistory, setShowHistory] = useState(false)
+  const inputRef = useRef<HTMLInputElement>(null)
+  const timerRef = useRef<null | ReturnType<typeof setTimeout>>(null)
+
+  const { addEntry, clearHistory, history } = useSearchHistory(persistenceKey)
+
+  const debounceMs = search?.debounceMs ?? DEFAULTS.searchDebounceMs
+  const placeholder = search?.placeholder ?? 'Search...'
+
+  const closeSearch = useCallback(() => {
+    setSearchOpen(false)
+    setQuery('')
+    setShowHistory(false)
+    table?.setGlobalFilter(undefined)
+  }, [setSearchOpen, table])
+
+  useEffect(() => {
+    if (isSearchOpen) {
+      // Defer focus to next frame so the input is mounted
+      requestAnimationFrame(() => inputRef.current?.focus())
+    }
+  }, [isSearchOpen])
+
+  const handleChange = useCallback((value: string) => {
+    setQuery(value)
+    setShowHistory(false)
+
+    if (timerRef.current) clearTimeout(timerRef.current)
+    timerRef.current = setTimeout(() => {
+      table?.setGlobalFilter(value || undefined)
+      if (value) addEntry(value)
+    }, debounceMs)
+  }, [table, debounceMs, addEntry])
+
+  // Handle Escape on the overlay container so it works regardless of which child has focus
+  const handleOverlayKeyDown = useCallback((e: React.KeyboardEvent) => {
+    if (e.key === 'Escape') {
+      e.preventDefault()
+      e.stopPropagation()
+      closeSearch()
+    }
+  }, [closeSearch])
+
+  const handleFocus = useCallback(() => {
+    if (!query && history.length > 0) {
+      setShowHistory(true)
+    }
+  }, [query, history.length])
+
+  const handleSelectHistory = useCallback((q: string) => {
+    setQuery(q)
+    setShowHistory(false)
+    table?.setGlobalFilter(q)
+  }, [table])
+
+  if (!isSearchOpen) return null
+
+  return (
+    <div
+      className={styles[CSS.searchOverlay]}
+      onKeyDown={handleOverlayKeyDown}
+    >
+      <Group gap={4} wrap="nowrap">
+        <TextInput
+          aria-label="Search grid"
+          onChange={(e) => handleChange(e.currentTarget.value)}
+          onFocus={handleFocus}
+          placeholder={placeholder}
+          ref={inputRef}
+          size="xs"
+          value={query}
+        />
+        <ActionIcon
+          aria-label="Close search"
+          onClick={closeSearch}
+          size="xs"
+          variant="subtle"
+        >
+          <IconX size={14} />
+        </ActionIcon>
+      </Group>
+      {showHistory && (
+        <SearchHistoryDropdown
+          history={history}
+          onClear={() => {
+            clearHistory()
+            setShowHistory(false)
+          }}
+          onSelect={handleSelectHistory}
+        />
+      )}
+    </div>
+  )
+}

src/Griddy/features/searchHistory/SearchHistoryDropdown.tsx

@@ -0,0 +1,40 @@
+import { ActionIcon, Group, Text } from '@mantine/core'
+import { IconTrash } from '@tabler/icons-react'
+
+import styles from '../../styles/griddy.module.css'
+
+interface SearchHistoryDropdownProps {
+  history: string[]
+  onClear: () => void
+  onSelect: (query: string) => void
+}
+
+export function SearchHistoryDropdown({ history, onClear, onSelect }: SearchHistoryDropdownProps) {
+  if (history.length === 0) return null
+
+  return (
+    <div className={styles['griddy-search-history']}>
+      <Group gap="xs" justify="space-between" mb={4}>
+        <Text c="dimmed" size="xs">Recent searches</Text>
+        <ActionIcon
+          color="gray"
+          onClick={onClear}
+          size="xs"
+          variant="subtle"
+        >
+          <IconTrash size={12} />
+        </ActionIcon>
+      </Group>
+      {history.map((query) => (
+        <button
+          className={styles['griddy-search-history-item']}
+          key={query}
+          onClick={() => onSelect(query)}
+          type="button"
+        >
+          {query}
+        </button>
+      ))}
+    </div>
+  )
+}

src/Griddy/features/searchHistory/index.ts

@@ -0,0 +1,2 @@
+export { SearchHistoryDropdown } from './SearchHistoryDropdown'
+export { useSearchHistory } from './useSearchHistory'

src/Griddy/features/searchHistory/useSearchHistory.ts

@@ -0,0 +1,45 @@
+import { useCallback, useState } from 'react';
+
+const MAX_HISTORY = 10;
+
+export function useSearchHistory(persistenceKey?: string) {
+  const key = persistenceKey ?? 'default';
+  const [history, setHistory] = useState<string[]>(() => loadHistory(key));
+
+  const addEntry = useCallback(
+    (query: string) => {
+      if (!query.trim()) return;
+      setHistory((prev) => {
+        const filtered = prev.filter((h) => h !== query);
+        const next = [query, ...filtered].slice(0, MAX_HISTORY);
+        saveHistory(key, next);
+        return next;
+      });
+    },
+    [key]
+  );
+
+  const clearHistory = useCallback(() => {
+    setHistory([]);
+    localStorage.removeItem(getStorageKey(key));
+  }, [key]);
+
+  return { addEntry, clearHistory, history };
+}
+
+function getStorageKey(persistenceKey: string) {
+  return `griddy-search-history-${persistenceKey}`;
+}
+
+function loadHistory(persistenceKey: string): string[] {
+  try {
+    const raw = localStorage.getItem(getStorageKey(persistenceKey));
+    return raw ? JSON.parse(raw) : [];
+  } catch {
+    return [];
+  }
+}
+
+function saveHistory(persistenceKey: string, history: string[]) {
+  localStorage.setItem(getStorageKey(persistenceKey), JSON.stringify(history));
+}

src/Griddy/features/toolbar/GridToolbar.tsx

@@ -0,0 +1,53 @@
+import type { Table } from '@tanstack/react-table'
+
+import { ActionIcon, Group } from '@mantine/core'
+import { IconDownload } from '@tabler/icons-react'
+
+import { ColumnVisibilityMenu } from '../columnVisibility'
+import { exportToCsv } from '../export'
+import { FilterPresetsMenu } from '../filterPresets'
+
+interface GridToolbarProps<T> {
+  exportFilename?: string
+  filterPresets?: boolean
+  persistenceKey?: string
+  showColumnToggle?: boolean
+  showExport?: boolean
+  table: Table<T>
+}
+
+export function GridToolbar<T>({
+  exportFilename = 'export.csv',
+  filterPresets = false,
+  persistenceKey,
+  showColumnToggle = true,
+  showExport = true,
+  table,
+}: GridToolbarProps<T>) {
+  const handleExport = () => {
+    exportToCsv(table, exportFilename)
+  }
+
+  if (!showExport && !showColumnToggle && !filterPresets) {
+    return null
+  }
+
+  return (
+    <Group gap="xs" justify="flex-end" p="xs" style={{ borderBottom: '1px solid var(--griddy-border-color, #e0e0e0)' }}>
+      {filterPresets && (
+        <FilterPresetsMenu persistenceKey={persistenceKey} table={table} />
+      )}
+      {showExport && (
+        <ActionIcon
+          aria-label="Export to CSV"
+          onClick={handleExport}
+          size="sm"
+          variant="subtle"
+        >
+          <IconDownload size={16} />
+        </ActionIcon>
+      )}
+      {showColumnToggle && <ColumnVisibilityMenu table={table} />}
+    </Group>
+  )
+}

src/Griddy/features/toolbar/index.ts

@@ -0,0 +1 @@
+export { GridToolbar } from './GridToolbar'

src/Griddy/features/tree/TreeExpandButton.tsx

@@ -0,0 +1,70 @@
+import type { ReactNode } from 'react';
+
+import { Loader } from '@mantine/core';
+
+import styles from '../../styles/griddy.module.css';
+
+interface TreeExpandButtonProps {
+  canExpand: boolean;
+  icons?: {
+    collapsed?: ReactNode;
+    expanded?: ReactNode;
+    leaf?: ReactNode;
+  };
+  isExpanded: boolean;
+  isLoading?: boolean;
+  onToggle: () => void;
+}
+
+const DEFAULT_ICONS = {
+  collapsed: '\u25B6', // ►
+  expanded: '\u25BC', // ▼
+  leaf: null,
+};
+
+export function TreeExpandButton({
+  canExpand,
+  icons = DEFAULT_ICONS,
+  isExpanded,
+  isLoading = false,
+  onToggle,
+}: TreeExpandButtonProps) {
+  const displayIcons = { ...DEFAULT_ICONS, ...icons };
+
+  // If loading, show spinner
+  if (isLoading) {
+    return (
+      <button
+        className={styles['griddy-tree-expand-button']}
+        disabled
+        style={{ cursor: 'wait' }}
+        type="button"
+      >
+        <Loader size="xs" />
+      </button>
+    );
+  }
+
+  // If can't expand (leaf node), show leaf icon or empty space
+  if (!canExpand) {
+    return (
+      <span className={styles['griddy-tree-expand-button']} style={{ cursor: 'default' }}>
+        {displayIcons.leaf || <span style={{ width: 20 }} />}
+      </span>
+    );
+  }
+
+  // Show expand/collapse icon
+  return (
+    <button
+      className={styles['griddy-tree-expand-button']}
+      onClick={(e) => {
+        e.stopPropagation();
+        onToggle();
+      }}
+      type="button"
+    >
+      {isExpanded ? displayIcons.expanded : displayIcons.collapsed}
+    </button>
+  );
+}

src/Griddy/features/tree/index.ts

@@ -0,0 +1,9 @@
+export {
+  hasChildren,
+  insertChildrenIntoData,
+  transformFlatToNested,
+} from './transformTreeData';
+export { TreeExpandButton } from './TreeExpandButton';
+export { useAutoExpandOnSearch } from './useAutoExpandOnSearch';
+export { useLazyTreeExpansion } from './useLazyTreeExpansion';
+export { useTreeData } from './useTreeData';

src/Griddy/features/tree/transformTreeData.ts

@@ -0,0 +1,138 @@
+import type { TreeConfig } from '../../core/types';
+
+/**
+ * Determines if a node has children (can be expanded)
+ * @param row - The data row
+ * @param config - Tree configuration
+ * @returns true if node has or can have children
+ */
+export function hasChildren<T>(row: any, config: TreeConfig<T>): boolean {
+  // If user provided hasChildren function, use it
+  if (config.hasChildren) {
+    return config.hasChildren(row);
+  }
+
+  // Check for children array
+  const childrenField = (config.childrenField as string) || 'children';
+  if (row[childrenField] && Array.isArray(row[childrenField])) {
+    return row[childrenField].length > 0;
+  }
+
+  // Check for subRows (TanStack Table convention)
+  if (row.subRows && Array.isArray(row.subRows)) {
+    return row.subRows.length > 0;
+  }
+
+  // Check for boolean flag (common pattern)
+  if (typeof row.hasChildren === 'boolean') {
+    return row.hasChildren;
+  }
+
+  // Check for childCount property
+  if (typeof row.childCount === 'number') {
+    return row.childCount > 0;
+  }
+
+  // Default: assume no children
+  return false;
+}
+
+/**
+ * Helper to insert children into data array at parent location
+ * Used by lazy loading to update the data array with fetched children
+ * @param data - Current data array
+ * @param parentId - ID of parent node
+ * @param children - Children to insert
+ * @param idField - Field name containing node ID
+ * @returns Updated data array with children inserted
+ */
+export function insertChildrenIntoData<T extends Record<string, any>>(
+  data: T[],
+  parentId: string,
+  children: T[],
+  idField: keyof T | string = 'id',
+): T[] {
+  return data.map((item) => {
+    if (item[idField] === parentId) {
+      // Found the parent - add children as subRows
+      return { ...item, subRows: children };
+    }
+    // Recursively search in subRows
+    if (item.subRows && Array.isArray(item.subRows)) {
+      return {
+        ...item,
+        subRows: insertChildrenIntoData(item.subRows, parentId, children, idField),
+      };
+    }
+    return item;
+  });
+}
+
+/**
+ * Transforms flat data with parentId references into nested tree structure
+ * @param data - Flat array of data with parent references
+ * @param parentIdField - Field name containing parent ID (default: 'parentId')
+ * @param idField - Field name containing node ID (default: 'id')
+ * @param maxDepth - Maximum tree depth to build (default: Infinity)
+ * @returns Array of root nodes with subRows property
+ */
+export function transformFlatToNested<T extends Record<string, any>>(
+  data: T[],
+  parentIdField: keyof T | string = 'parentId',
+  idField: keyof T | string = 'id',
+  maxDepth = Infinity,
+): T[] {
+  // Build a map of id -> node for quick lookups
+  const nodeMap = new Map<any, { subRows?: T[] } & T>();
+  const roots: ({ subRows?: T[] } & T)[] = [];
+
+  // First pass: create map of all nodes
+  data.forEach((item) => {
+    nodeMap.set(item[idField], { ...item, subRows: [] });
+  });
+
+  // Second pass: build tree structure
+  data.forEach((item) => {
+    const node = nodeMap.get(item[idField])!;
+    const parentId = item[parentIdField];
+
+    if (parentId == null || parentId === '') {
+      // Root node (no parent or empty parent)
+      roots.push(node);
+    } else {
+      const parent = nodeMap.get(parentId);
+      if (parent) {
+        // Add to parent's children
+        if (!parent.subRows) {
+          parent.subRows = [];
+        }
+        parent.subRows.push(node);
+      } else {
+        // Orphaned node (parent doesn't exist) - treat as root
+        roots.push(node);
+      }
+    }
+  });
+
+  // Enforce max depth by removing children beyond the limit
+  if (maxDepth !== Infinity) {
+    const enforceDepth = (nodes: ({ subRows?: T[] } & T)[], currentDepth: number) => {
+      if (currentDepth >= maxDepth) {
+        return;
+      }
+      nodes.forEach((node) => {
+        if (node.subRows && node.subRows.length > 0) {
+          if (currentDepth + 1 >= maxDepth) {
+            // Remove children at max depth
+            delete node.subRows;
+          } else {
+            enforceDepth(node.subRows, currentDepth + 1);
+          }
+        }
+      });
+    };
+    enforceDepth(roots, 0);
+  }
+
+  return roots;
+}

src/Griddy/features/tree/useAutoExpandOnSearch.ts

@@ -0,0 +1,87 @@
+import type { Table } from '@tanstack/react-table';
+
+import { useEffect, useRef } from 'react';
+
+import type { TreeConfig } from '../../core/types';
+
+interface UseAutoExpandOnSearchOptions<TData> {
+  globalFilter?: string;
+  table: Table<TData>;
+  tree?: TreeConfig<TData>;
+}
+
+/**
+ * Hook to auto-expand parent nodes when search matches child nodes
+ */
+export function useAutoExpandOnSearch<TData>({
+  globalFilter: globalFilterProp,
+  table,
+  tree,
+}: UseAutoExpandOnSearchOptions<TData>) {
+  const previousFilterRef = useRef<string | undefined>(undefined);
+  const previousExpandedRef = useRef<Record<string, boolean>>({});
+
+  useEffect(() => {
+    // Only handle if tree is enabled and autoExpandOnSearch is not disabled
+    if (!tree?.enabled || tree.autoExpandOnSearch === false) {
+      return;
+    }
+
+    const globalFilter = table.getState().globalFilter;
+    const previousFilter = previousFilterRef.current;
+
+    // Update ref
+    previousFilterRef.current = globalFilter;
+
+    // If filter was cleared, optionally restore previous expanded state
+    if (!globalFilter && previousFilter) {
+      // Filter was cleared - leave expanded state as-is
+      return;
+    }
+
+    // If no filter or filter unchanged, skip
+    if (!globalFilter || globalFilter === previousFilter) {
+      return;
+    }
+
+    // Use flatRows to get all rows at all depths in the filtered model
+    const filteredFlatRows = table.getFilteredRowModel().flatRows;
+
+    if (filteredFlatRows.length === 0) {
+      return;
+    }
+
+    // Build set of all ancestors that should be expanded
+    const toExpand: Record<string, boolean> = {};
+
+    // Build a lookup map from flatRows for fast parent resolution
+    const rowById = new Map<string, (typeof filteredFlatRows)[0]>();
+    filteredFlatRows.forEach((row) => rowById.set(row.id, row));
+
+    filteredFlatRows.forEach((row) => {
+      // If row has depth > 0, walk up parent chain and expand all ancestors
+      if (row.depth > 0) {
+        let current = row;
+        while (current.parentId) {
+          toExpand[current.parentId] = true;
+          const parent = rowById.get(current.parentId);
+          if (!parent) break;
+          current = parent;
+        }
+      }
+    });
+
+    // Merge with current expanded state
+    const currentExpanded = table.getState().expanded;
+    const newExpanded = { ...currentExpanded, ...toExpand };
+
+    // Only update if there are changes
+    if (Object.keys(toExpand).length > 0) {
+      // Save previous expanded state before search (for potential restore)
+      if (!previousFilter) {
+        previousExpandedRef.current = currentExpanded;
+      }
+      table.setExpanded(newExpanded);
+    }
+  }, [tree, table, globalFilterProp]);
+}

src/Griddy/features/tree/useLazyTreeExpansion.ts

@@ -0,0 +1,104 @@
+import type { Table } from '@tanstack/react-table';
+
+import { useEffect, useRef } from 'react';
+
+import type { TreeConfig } from '../../core/types';
+
+import { insertChildrenIntoData } from './transformTreeData';
+
+interface UseLazyTreeExpansionOptions<T> {
+  data: T[];
+  expanded: Record<string, boolean> | true;
+  setData: (data: T[]) => void;
+  setTreeChildrenCache: (nodeId: string, children: T[]) => void;
+  setTreeLoadingNode: (nodeId: string, loading: boolean) => void;
+  table: Table<T>;
+  tree?: TreeConfig<T>;
+  treeChildrenCache: Map<string, T[]>;
+}
+
+/**
+ * Hook to handle lazy loading of tree children when nodes are expanded
+ */
+export function useLazyTreeExpansion<T extends Record<string, any>>({
+  data,
+  expanded: expandedState,
+  setData,
+  setTreeChildrenCache,
+  setTreeLoadingNode,
+  table,
+  tree,
+  treeChildrenCache,
+}: UseLazyTreeExpansionOptions<T>) {
+  const expandedRef = useRef<Record<string, boolean>>({});
+
+  useEffect(() => {
+    // Only handle lazy mode
+    if (!tree?.enabled || tree.mode !== 'lazy' || !tree.getChildren) {
+      return;
+    }
+
+    const expanded = typeof expandedState === 'object' ? expandedState : {};
+    const previousExpanded = expandedRef.current;
+
+    // Find newly expanded nodes
+    const newlyExpanded = Object.keys(expanded).filter(
+      (id) => expanded[id] && !previousExpanded[id]
+    );
+
+    // Update ref
+    expandedRef.current = { ...expanded };
+
+    if (newlyExpanded.length === 0) {
+      return;
+    }
+
+    // For each newly expanded node, check if children need to be loaded
+    newlyExpanded.forEach(async (rowId) => {
+      // Check if children already loaded
+      const row = table.getRowModel().rows.find((r) => r.id === rowId);
+      if (!row) return;
+
+      const hasSubRows = row.subRows && row.subRows.length > 0;
+      const hasCachedChildren = treeChildrenCache.has(rowId);
+
+      // If children already loaded or cached, skip
+      if (hasSubRows || hasCachedChildren) {
+        if (hasCachedChildren && !hasSubRows) {
+          // Apply cached children to data
+          const cached = treeChildrenCache.get(rowId)!;
+          const updatedData = insertChildrenIntoData(data, rowId, cached);
+          setData(updatedData);
+        }
+        return;
+      }
+
+      // Load children
+      try {
+        setTreeLoadingNode(rowId, true);
+        const children = await Promise.resolve(tree.getChildren!(row.original));
+
+        // Cache children
+        setTreeChildrenCache(rowId, children);
+
+        // Insert children into data
+        const updatedData = insertChildrenIntoData(data, rowId, children);
+        setData(updatedData);
+      } catch (error) {
+        console.error('Failed to load tree children:', error);
+        // Optionally: trigger error callback or toast
+      } finally {
+        setTreeLoadingNode(rowId, false);
+      }
+    });
+  }, [
+    tree,
+    table,
+    expandedState,
+    data,
+    setData,
+    setTreeLoadingNode,
+    setTreeChildrenCache,
+    treeChildrenCache,
+  ]);
+}

src/Griddy/features/tree/useTreeData.ts

@@ -0,0 +1,64 @@
+import { useMemo } from 'react';
+
+import type { TreeConfig } from '../../core/types';
+
+import { transformFlatToNested } from './transformTreeData';
+
+/**
+ * Hook to transform data based on tree mode
+ * @param data - Raw data array
+ * @param tree - Tree configuration
+ * @returns Transformed data ready for TanStack Table
+ */
+export function useTreeData<T extends Record<string, any>>(
+  data: T[],
+  tree?: TreeConfig<T>,
+): T[] {
+  return useMemo(() => {
+    if (!tree?.enabled || !data) {
+      return data;
+    }
+
+    const mode = tree.mode || 'nested';
+
+    switch (mode) {
+      case 'flat': {
+        // Transform flat data with parentId to nested structure
+        const parentIdField = tree.parentIdField || 'parentId';
+        const idField = 'id'; // Assume 'id' field exists
+        const maxDepth = tree.maxDepth || Infinity;
+        return transformFlatToNested(data, parentIdField, idField, maxDepth);
+      }
+
+      case 'lazy': {
+        // Lazy mode: data is already structured, children loaded on-demand
+        // Just return data as-is, lazy loading hook will handle expansion
+        return data;
+      }
+
+      case 'nested': {
+        // If childrenField is not 'subRows', map it
+        const childrenField = (tree.childrenField as string) || 'children';
+        if (childrenField === 'subRows' || childrenField === 'children') {
+          // Already in correct format or standard format
+          return data.map((item) => {
+            if (childrenField === 'children' && item.children) {
+              return { ...item, subRows: item.children };
+            }
+            return item;
+          });
+        }
+        // Map custom children field to subRows
+        return data.map((item) => {
+          if (item[childrenField]) {
+            return { ...item, subRows: item[childrenField] };
+          }
+          return item;
+        });
+      }
+
+      default:
+        return data;
+    }
+  }, [data, tree]);
+}

src/Griddy/index.ts

@@ -0,0 +1,48 @@
+// Adapter exports
+export {
+  applyCursor,
+  buildOptions,
+  HeaderSpecAdapter,
+  mapFilters,
+  mapPagination,
+  mapSorting,
+  ResolveSpecAdapter,
+} from './adapters';
+export type { AdapterConfig, AdapterRef } from './adapters';
+export { getGriddyColumn, mapColumns } from './core/columnMapper';
+export { CSS, DEFAULTS, SELECTION_COLUMN_ID } from './core/constants';
+export { Griddy } from './core/Griddy';
+export { GriddyProvider, useGriddyStore } from './core/GriddyStore';
+
+export type { GriddyStoreState } from './core/GriddyStore';
+export type {
+  AdvancedSearchConfig,
+  CellRenderer,
+  DataAdapter,
+  EditorComponent,
+  EditorProps,
+  FetchConfig,
+  GriddyColumn,
+  GriddyDataSource,
+  GriddyProps,
+  GriddyRef,
+  GriddyUIState,
+  GroupingConfig,
+  PaginationConfig,
+  RendererProps,
+  SearchConfig,
+  SelectionConfig,
+} from './core/types';
+// Feature exports
+export { GriddyErrorBoundary } from './features/errorBoundary';
+export { FilterPresetsMenu, useFilterPresets } from './features/filterPresets';
+export type { FilterPreset } from './features/filterPresets';
+export { GriddyLoadingOverlay, GriddyLoadingSkeleton } from './features/loading';
+
+export {
+  BadgeRenderer,
+  ImageRenderer,
+  ProgressBarRenderer,
+  SparklineRenderer,
+} from './features/renderers';
+export { useSearchHistory } from './features/searchHistory';

src/Griddy/rendering/EditableCell.tsx

@@ -0,0 +1,132 @@
+import type { Cell } from '@tanstack/react-table';
+
+import { useCallback, useEffect, useState } from 'react';
+
+import type { EditorConfig } from '../editors';
+
+import { getGriddyColumn } from '../core/columnMapper';
+import { CheckboxEditor, DateEditor, NumericEditor, SelectEditor, TextEditor } from '../editors';
+
+interface EditableCellProps<T> {
+  cell: Cell<T, unknown>;
+  isEditing: boolean;
+  onCancelEdit: () => void;
+  onCommitEdit: (value: unknown) => void;
+  onMoveNext?: () => void;
+  onMovePrev?: () => void;
+}
+
+export function EditableCell<T>({
+  cell,
+  isEditing,
+  onCancelEdit,
+  onCommitEdit,
+  onMoveNext,
+  onMovePrev,
+}: EditableCellProps<T>) {
+  const griddyColumn = getGriddyColumn(cell.column);
+  const editorConfig: EditorConfig = (griddyColumn as any)?.editorConfig ?? {};
+  const customEditor = (griddyColumn as any)?.editor;
+
+  const [value, setValue] = useState(cell.getValue());
+
+  useEffect(() => {
+    setValue(cell.getValue());
+  }, [cell]);
+
+  const handleCommit = useCallback(
+    (newValue: unknown) => {
+      setValue(newValue);
+      onCommitEdit(newValue);
+    },
+    [onCommitEdit]
+  );
+
+  const handleCancel = useCallback(() => {
+    setValue(cell.getValue());
+    onCancelEdit();
+  }, [cell, onCancelEdit]);
+
+  if (!isEditing) {
+    return null;
+  }
+
+  // Custom editor from column definition
+  if (customEditor) {
+    const EditorComponent = customEditor as any;
+    return (
+      <EditorComponent
+        onCancel={handleCancel}
+        onCommit={handleCommit}
+        onMoveNext={onMoveNext}
+        onMovePrev={onMovePrev}
+        value={value}
+      />
+    );
+  }
+
+  // Built-in editors based on editorConfig.type
+  const editorType = editorConfig.type ?? 'text';
+
+  switch (editorType) {
+    case 'checkbox':
+      return (
+        <CheckboxEditor
+          onCancel={handleCancel}
+          onCommit={handleCommit}
+          onMoveNext={onMoveNext}
+          onMovePrev={onMovePrev}
+          value={value as boolean}
+        />
+      );
+
+    case 'date':
+      return (
+        <DateEditor
+          onCancel={handleCancel}
+          onCommit={handleCommit}
+          onMoveNext={onMoveNext}
+          onMovePrev={onMovePrev}
+          value={value as Date | string}
+        />
+      );
+
+    case 'number':
+      return (
+        <NumericEditor
+          max={editorConfig.max}
+          min={editorConfig.min}
+          onCancel={handleCancel}
+          onCommit={handleCommit}
+          onMoveNext={onMoveNext}
+          onMovePrev={onMovePrev}
+          step={editorConfig.step}
+          value={value as number}
+        />
+      );
+
+    case 'select':
+      return (
+        <SelectEditor
+          onCancel={handleCancel}
+          onCommit={handleCommit}
+          onMoveNext={onMoveNext}
+          onMovePrev={onMovePrev}
+          options={editorConfig.options ?? []}
+          value={value}
+        />
+      );
+
+    case 'text':
+    default:
+      return (
+        <TextEditor
+          onCancel={handleCancel}
+          onCommit={handleCommit}
+          onMoveNext={onMoveNext}
+          onMovePrev={onMovePrev}
+          value={value as string}
+        />
+      );
+  }
+}

src/Griddy/rendering/TableCell.tsx

@@ -0,0 +1,180 @@
+import { Checkbox } from '@mantine/core';
+import { type Cell, flexRender } from '@tanstack/react-table';
+
+import { getGriddyColumn } from '../core/columnMapper';
+import { CSS, SELECTION_COLUMN_ID } from '../core/constants';
+import { useGriddyStore } from '../core/GriddyStore';
+import { TreeExpandButton } from '../features/tree/TreeExpandButton';
+import styles from '../styles/griddy.module.css';
+import { EditableCell } from './EditableCell';
+
+interface TableCellProps<T> {
+  cell: Cell<T, unknown>;
+  showGrouping?: boolean;
+}
+
+export function TableCell<T>({ cell, showGrouping }: TableCellProps<T>) {
+  const isSelectionCol = cell.column.id === SELECTION_COLUMN_ID;
+  const isEditing = useGriddyStore((s) => s.isEditing);
+  const focusedRowIndex = useGriddyStore((s) => s.focusedRowIndex);
+  const focusedColumnId = useGriddyStore((s) => s.focusedColumnId);
+  const setEditing = useGriddyStore((s) => s.setEditing);
+  const setFocusedColumn = useGriddyStore((s) => s.setFocusedColumn);
+  const onEditCommit = useGriddyStore((s) => s.onEditCommit);
+  const tree = useGriddyStore((s) => s.tree);
+  const treeLoadingNodes = useGriddyStore((s) => s.treeLoadingNodes);
+  const selection = useGriddyStore((s) => s.selection);
+
+  if (isSelectionCol) {
+    return <RowCheckbox cell={cell} />;
+  }
+
+  const griddyColumn = getGriddyColumn(cell.column);
+  const rowIndex = cell.row.index;
+  const columnId = cell.column.id;
+  const isEditable = (griddyColumn as any)?.editable ?? false;
+  const isFocusedCell = isEditing && focusedRowIndex === rowIndex && focusedColumnId === columnId;
+
+  const handleCommit = async (value: unknown) => {
+    if (onEditCommit) {
+      await onEditCommit(cell.row.id, columnId, value);
+    }
+    setEditing(false);
+    setFocusedColumn(null);
+  };
+
+  const handleCancel = () => {
+    setEditing(false);
+    setFocusedColumn(null);
+  };
+
+  const handleDoubleClick = () => {
+    if (isEditable) {
+      setEditing(true);
+      setFocusedColumn(columnId);
+    }
+  };
+
+  const isPinned = cell.column.getIsPinned();
+  const leftOffset = isPinned === 'left' ? cell.column.getStart('left') : undefined;
+  const rightOffset = isPinned === 'right' ? cell.column.getAfter('right') : undefined;
+
+  const isGrouped = cell.getIsGrouped();
+  const isAggregated = cell.getIsAggregated();
+  const isPlaceholder = cell.getIsPlaceholder();
+
+  // Tree support
+  const depth = cell.row.depth;
+  const canExpand =
+    cell.row.getCanExpand() ||
+    (tree?.enabled && tree?.mode === 'lazy' && tree?.hasChildren?.(cell.row.original as any)) ||
+    false;
+  const isExpanded = cell.row.getIsExpanded();
+  const hasSelection = selection != null && selection.mode !== 'none';
+  const columnIndex = cell.column.getIndex();
+  // First content column is index 0 if no selection, or index 1 if selection enabled
+  const isFirstColumn = hasSelection ? columnIndex === 1 : columnIndex === 0;
+  const indentSize = tree?.indentSize ?? 20;
+  const showTreeButton = tree?.enabled && isFirstColumn && tree?.showExpandIcon !== false;
+
+  return (
+    <div
+      className={[
+        styles[CSS.cell],
+        isPinned === 'left' ? styles['griddy-cell--pinned-left'] : '',
+        isPinned === 'right' ? styles['griddy-cell--pinned-right'] : '',
+      ]
+        .filter(Boolean)
+        .join(' ')}
+      onDoubleClick={handleDoubleClick}
+      role="gridcell"
+      style={{
+        left: leftOffset !== undefined ? `${leftOffset}px` : undefined,
+        paddingLeft: isFirstColumn && tree?.enabled ? `${depth * indentSize + 8}px` : undefined,
+        position: isPinned ? 'sticky' : 'relative',
+        right: rightOffset !== undefined ? `${rightOffset}px` : undefined,
+        width: cell.column.getSize(),
+        zIndex: isPinned ? 1 : 0,
+      }}
+    >
+      {showTreeButton && (
+        <TreeExpandButton
+          canExpand={canExpand}
+          icons={tree?.icons}
+          isExpanded={isExpanded}
+          isLoading={treeLoadingNodes.has(cell.row.id)}
+          onToggle={() => cell.row.toggleExpanded()}
+        />
+      )}
+      {showGrouping && isGrouped && (
+        <button
+          onClick={() => cell.row.toggleExpanded()}
+          style={{
+            background: 'none',
+            border: 'none',
+            cursor: 'pointer',
+            marginRight: 4,
+            padding: 0,
+          }}
+        >
+          {cell.row.getIsExpanded() ? '\u25BC' : '\u25B6'}
+        </button>
+      )}
+      {isFocusedCell && isEditable ? (
+        <EditableCell
+          cell={cell}
+          isEditing={isFocusedCell}
+          onCancelEdit={handleCancel}
+          onCommitEdit={handleCommit}
+        />
+      ) : isGrouped ? (
+        <>
+          {flexRender(cell.column.columnDef.cell, cell.getContext())} ({cell.row.subRows.length})
+        </>
+      ) : isAggregated ? (
+        flexRender(
+          cell.column.columnDef.aggregatedCell ?? cell.column.columnDef.cell,
+          cell.getContext()
+        )
+      ) : isPlaceholder ? null : (
+        flexRender(cell.column.columnDef.cell, cell.getContext())
+      )}
+    </div>
+  );
+}
+
+function RowCheckbox<T>({ cell }: TableCellProps<T>) {
+  const row = cell.row;
+  const isPinned = cell.column.getIsPinned();
+  const leftOffset = isPinned === 'left' ? cell.column.getStart('left') : undefined;
+  const rightOffset = isPinned === 'right' ? cell.column.getAfter('right') : undefined;
+
+  return (
+    <div
+      className={[
+        styles[CSS.cell],
+        isPinned === 'left' ? styles['griddy-cell--pinned-left'] : '',
+        isPinned === 'right' ? styles['griddy-cell--pinned-right'] : '',
+      ]
+        .filter(Boolean)
+        .join(' ')}
+      role="gridcell"
+      style={{
+        left: leftOffset !== undefined ? `${leftOffset}px` : undefined,
+        position: isPinned ? 'sticky' : 'relative',
+        right: rightOffset !== undefined ? `${rightOffset}px` : undefined,
+        width: cell.column.getSize(),
+        zIndex: isPinned ? 1 : 0,
+      }}
+    >
+      <Checkbox
+        aria-label={`Select row ${row.index + 1}`}
+        checked={row.getIsSelected()}
+        disabled={!row.getCanSelect()}
+        onChange={row.getToggleSelectedHandler()}
+        onClick={(e) => e.stopPropagation()}
+        size="xs"
+      />
+    </div>
+  );
+}

src/Griddy/rendering/TableHeader.tsx

@@ -0,0 +1,169 @@
+import { Checkbox } from '@mantine/core';
+import { flexRender } from '@tanstack/react-table';
+import { useState } from 'react';
+
+import { CSS, SELECTION_COLUMN_ID } from '../core/constants';
+import { useGriddyStore } from '../core/GriddyStore';
+import { ColumnFilterPopover, HeaderContextMenu } from '../features/filtering';
+import styles from '../styles/griddy.module.css';
+
+export function TableHeader() {
+  const table = useGriddyStore((s) => s._table);
+  const [filterPopoverOpen, setFilterPopoverOpen] = useState<null | string>(null);
+  const [draggedColumn, setDraggedColumn] = useState<null | string>(null);
+
+  if (!table) return null;
+
+  const headerGroups = table.getHeaderGroups();
+
+  const handleDragStart = (e: React.DragEvent, columnId: string) => {
+    setDraggedColumn(columnId);
+    e.dataTransfer.effectAllowed = 'move';
+    e.dataTransfer.setData('text/plain', columnId);
+  };
+
+  const handleDragOver = (e: React.DragEvent) => {
+    e.preventDefault();
+    e.dataTransfer.dropEffect = 'move';
+  };
+
+  const handleDrop = (e: React.DragEvent, targetColumnId: string) => {
+    e.preventDefault();
+    if (!draggedColumn || draggedColumn === targetColumnId) {
+      setDraggedColumn(null);
+      return;
+    }
+
+    const columnOrder = table.getState().columnOrder;
+    const currentOrder = columnOrder.length
+      ? columnOrder
+      : table.getAllLeafColumns().map((c) => c.id);
+
+    const draggedIdx = currentOrder.indexOf(draggedColumn);
+    const targetIdx = currentOrder.indexOf(targetColumnId);
+
+    if (draggedIdx === -1 || targetIdx === -1) {
+      setDraggedColumn(null);
+      return;
+    }
+
+    const newOrder = [...currentOrder];
+    newOrder.splice(draggedIdx, 1);
+    newOrder.splice(targetIdx, 0, draggedColumn);
+
+    table.setColumnOrder(newOrder);
+    setDraggedColumn(null);
+  };
+
+  const handleDragEnd = () => {
+    setDraggedColumn(null);
+  };
+
+  return (
+    <div className={styles[CSS.thead]} role="rowgroup">
+      {headerGroups.map((headerGroup) => (
+        <div className={styles[CSS.headerRow]} key={headerGroup.id} role="row">
+          {headerGroup.headers.map((header) => {
+            const isSortable = header.column.getCanSort();
+            const sortDir = header.column.getIsSorted();
+            const isSelectionCol = header.column.id === SELECTION_COLUMN_ID;
+            const isFilterPopoverOpen = filterPopoverOpen === header.column.id;
+            const isPinned = header.column.getIsPinned();
+            const leftOffset = isPinned === 'left' ? header.getStart('left') : undefined;
+            const rightOffset = isPinned === 'right' ? header.column.getAfter('right') : undefined;
+
+            const isDragging = draggedColumn === header.column.id;
+            const canReorder = !isSelectionCol && !isPinned;
+
+            return (
+              <div
+                aria-sort={
+                  sortDir === 'asc' ? 'ascending' : sortDir === 'desc' ? 'descending' : 'none'
+                }
+                className={[
+                  styles[CSS.headerCell],
+                  isSortable ? styles[CSS.headerCellSortable] : '',
+                  sortDir ? styles[CSS.headerCellSorted] : '',
+                  isPinned === 'left' ? styles['griddy-header-cell--pinned-left'] : '',
+                  isPinned === 'right' ? styles['griddy-header-cell--pinned-right'] : '',
+                  isDragging ? styles['griddy-header-cell--dragging'] : '',
+                ]
+                  .filter(Boolean)
+                  .join(' ')}
+                draggable={canReorder}
+                key={header.id}
+                onClick={isSortable ? header.column.getToggleSortingHandler() : undefined}
+                onDragEnd={handleDragEnd}
+                onDragOver={handleDragOver}
+                onDragStart={(e) => canReorder && handleDragStart(e, header.column.id)}
+                onDrop={(e) => canReorder && handleDrop(e, header.column.id)}
+                role="columnheader"
+                style={{
+                  cursor: canReorder ? 'move' : undefined,
+                  left: leftOffset !== undefined ? `${leftOffset}px` : undefined,
+                  opacity: isDragging ? 0.5 : 1,
+                  position: isPinned ? 'sticky' : 'relative',
+                  right: rightOffset !== undefined ? `${rightOffset}px` : undefined,
+                  width: header.getSize(),
+                  zIndex: isPinned ? 2 : 1,
+                }}
+              >
+                {isSelectionCol ? (
+                  <SelectAllCheckbox />
+                ) : header.isPlaceholder ? null : (
+                  <HeaderContextMenu
+                    column={header.column}
+                    onOpenFilter={() => setFilterPopoverOpen(header.column.id)}
+                  >
+                    <div className={styles[CSS.headerCellContent]}>
+                      {flexRender(header.column.columnDef.header, header.getContext())}
+                      {sortDir && (
+                        <span className={styles[CSS.sortIndicator]}>
+                          {sortDir === 'asc' ? ' \u2191' : ' \u2193'}
+                        </span>
+                      )}
+                      {header.column.getCanFilter() && (
+                        <ColumnFilterPopover
+                          column={header.column}
+                          onOpenedChange={(opened) =>
+                            setFilterPopoverOpen(opened ? header.column.id : null)
+                          }
+                          opened={isFilterPopoverOpen}
+                        />
+                      )}
+                    </div>
+                  </HeaderContextMenu>
+                )}
+                {header.column.getCanResize() && (
+                  <div
+                    className={styles[CSS.resizeHandle]}
+                    onDoubleClick={() => header.column.resetSize()}
+                    onMouseDown={header.getResizeHandler()}
+                    onTouchStart={header.getResizeHandler()}
+                  />
+                )}
+              </div>
+            );
+          })}
+        </div>
+      ))}
+    </div>
+  );
+}
+
+function SelectAllCheckbox() {
+  const table = useGriddyStore((s) => s._table);
+  const selection = useGriddyStore((s) => s.selection);
+
+  if (!table || !selection || selection.mode !== 'multi') return null;
+
+  return (
+    <Checkbox
+      aria-label="Select all rows"
+      checked={table.getIsAllRowsSelected()}
+      indeterminate={table.getIsSomeRowsSelected()}
+      onChange={table.getToggleAllRowsSelectedHandler()}
+      size="xs"
+    />
+  );
+}

src/Griddy/rendering/TableRow.tsx

@@ -0,0 +1,69 @@
+import type { Row } from '@tanstack/react-table'
+
+import { useCallback } from 'react'
+
+import { CSS } from '../core/constants'
+import { useGriddyStore } from '../core/GriddyStore'
+import styles from '../styles/griddy.module.css'
+import { TableCell } from './TableCell'
+
+interface TableRowProps<T> {
+  row: Row<T>
+  size: number
+  start: number
+}
+
+export function TableRow<T>({ row, size, start }: TableRowProps<T>) {
+  const selection = useGriddyStore((s) => s.selection)
+  const focusedRowIndex = useGriddyStore((s) => s.focusedRowIndex)
+  const setFocusedRow = useGriddyStore((s) => s.setFocusedRow)
+
+  const isFocused = focusedRowIndex === row.index
+  const isSelected = row.getIsSelected()
+  const isEven = row.index % 2 === 0
+
+  const handleClick = useCallback(() => {
+    setFocusedRow(row.index)
+
+    if (selection && selection.mode !== 'none' && selection.selectOnClick !== false) {
+      if (selection.mode === 'single') {
+        row.toggleSelected(true)
+      } else {
+        row.toggleSelected()
+      }
+    }
+  }, [row, selection, setFocusedRow])
+
+  const classNames = [
+    styles[CSS.row],
+    isFocused ? styles[CSS.rowFocused] : '',
+    isSelected ? styles[CSS.rowSelected] : '',
+    isEven ? styles[CSS.rowEven] : '',
+    !isEven ? styles[CSS.rowOdd] : '',
+    row.getIsGrouped() ? styles['griddy-row--grouped'] : '',
+  ].filter(Boolean).join(' ')
+
+  return (
+    <div
+      aria-rowindex={row.index + 1}
+      aria-selected={isSelected}
+      className={classNames}
+      id={`griddy-row-${row.id}`}
+      onClick={handleClick}
+      role="row"
+      style={{
+        display: 'flex',
+        height: size,
+        left: 0,
+        position: 'absolute',
+        top: 0,
+        transform: `translateY(${start}px)`,
+        width: '100%',
+      }}
+    >
+      {row.getVisibleCells().map((cell, index) => (
+        <TableCell cell={cell} key={cell.id} showGrouping={index === 0} />
+      ))}
+    </div>
+  )
+}

src/Griddy/rendering/VirtualBody.tsx

@@ -0,0 +1,98 @@
+import { useEffect, useRef } from 'react';
+
+import { CSS } from '../core/constants';
+import { useGriddyStore } from '../core/GriddyStore';
+import styles from '../styles/griddy.module.css';
+import { TableRow } from './TableRow';
+
+export function VirtualBody() {
+  const table = useGriddyStore((s) => s._table);
+  const virtualizer = useGriddyStore((s) => s._virtualizer);
+  const setTotalRows = useGriddyStore((s) => s.setTotalRows);
+  const infiniteScroll = useGriddyStore((s) => s.infiniteScroll);
+
+  const rows = table?.getRowModel().rows;
+  const virtualRows = virtualizer?.getVirtualItems();
+  const totalSize = virtualizer?.getTotalSize() ?? 0;
+
+  // Track if we're currently loading to prevent multiple simultaneous calls
+  const isLoadingRef = useRef(false);
+
+  // Sync row count to store for keyboard navigation bounds
+  useEffect(() => {
+    if (rows) {
+      setTotalRows(rows.length);
+    }
+  }, [rows?.length, setTotalRows]);
+
+  // Infinite scroll: detect when approaching the end
+  useEffect(() => {
+    if (!infiniteScroll?.enabled || !infiniteScroll.onLoadMore || !virtualRows || !rows) {
+      return;
+    }
+
+    const { hasMore = true, isLoading = false, threshold = 10 } = infiniteScroll;
+
+    // Don't trigger if already loading or no more data
+    if (isLoading || !hasMore || isLoadingRef.current) {
+      return;
+    }
+
+    // Check if the last rendered virtual row is within threshold of the end
+    const lastVirtualRow = virtualRows[virtualRows.length - 1];
+    if (!lastVirtualRow) return;
+
+    const lastVirtualIndex = lastVirtualRow.index;
+    const totalRows = rows.length;
+    const distanceFromEnd = totalRows - lastVirtualIndex - 1;
+
+    if (distanceFromEnd <= threshold) {
+      isLoadingRef.current = true;
+      const loadPromise = infiniteScroll.onLoadMore();
+
+      if (loadPromise instanceof Promise) {
+        loadPromise.finally(() => {
+          isLoadingRef.current = false;
+        });
+      } else {
+        isLoadingRef.current = false;
+      }
+    }
+  }, [virtualRows, rows, infiniteScroll]);
+
+  if (!table || !virtualizer || !rows || !virtualRows) return null;
+
+  const showLoadingIndicator = infiniteScroll?.enabled && infiniteScroll.isLoading;
+
+  return (
+    <div
+      className={styles[CSS.tbody]}
+      role="rowgroup"
+      style={{
+        height: totalSize,
+        position: 'relative',
+        width: '100%',
+      }}
+    >
+      {virtualRows.map((virtualRow) => {
+        const row = rows[virtualRow.index];
+        if (!row) return null;
+
+        return <TableRow key={row.id} row={row} size={virtualRow.size} start={virtualRow.start} />;
+      })}
+      {showLoadingIndicator && (
+        <div
+          className={styles['griddy-loading-indicator']}
+          style={{
+            bottom: 0,
+            left: 0,
+            position: 'absolute',
+            right: 0,
+          }}
+        >
+          <div className={styles['griddy-loading-spinner']}>Loading more...</div>
+        </div>
+      )}
+    </div>
+  );
+}

src/Griddy/rendering/hooks/useGridVirtualizer.ts

@@ -0,0 +1,29 @@
+import type { Table } from '@tanstack/react-table'
+import type { RefObject } from 'react'
+
+import { useVirtualizer, type Virtualizer } from '@tanstack/react-virtual'
+
+import { DEFAULTS } from '../../core/constants'
+
+interface UseGridVirtualizerOptions {
+  overscan?: number
+  rowHeight?: number
+  scrollRef: RefObject<HTMLDivElement | null>
+  table: Table<any>
+}
+
+export function useGridVirtualizer({
+  overscan = DEFAULTS.overscan,
+  rowHeight = DEFAULTS.rowHeight,
+  scrollRef,
+  table,
+}: UseGridVirtualizerOptions): Virtualizer<HTMLDivElement, Element> {
+  const rowCount = table.getRowModel().rows.length
+
+  return useVirtualizer({
+    count: rowCount,
+    estimateSize: () => rowHeight,
+    getScrollElement: () => scrollRef.current,
+    overscan,
+  })
+}

src/Griddy/styles/griddy.module.css

@@ -0,0 +1,654 @@
+/* ─── Root ──────────────────────────────────────────────────────────────── */
+
+.griddy {
+  --griddy-font-family: inherit;
+  --griddy-font-size: 14px;
+  --griddy-border-color: #e0e0e0;
+  --griddy-header-bg: #f8f9fa;
+  --griddy-header-color: #212529;
+  --griddy-row-bg: #ffffff;
+  --griddy-row-hover-bg: #f1f3f5;
+  --griddy-row-even-bg: #f8f9fa;
+  --griddy-focus-color: #228be6;
+  --griddy-selection-bg: rgba(34, 139, 230, 0.1);
+  --griddy-cell-padding: 0 8px;
+  --griddy-search-bg: #ffffff;
+  --griddy-search-border: #dee2e6;
+
+  font-family: var(--griddy-font-family);
+  font-size: var(--griddy-font-size);
+  position: relative;
+  width: 100%;
+  border: 1px solid var(--griddy-border-color);
+  border-radius: 4px;
+  overflow: hidden;
+}
+
+/* ─── Container (scroll area) ──────────────────────────────────────────── */
+
+.griddy-container {
+  outline: none;
+}
+
+.griddy-container:focus-visible {
+  box-shadow: inset 0 0 0 2px var(--griddy-focus-color);
+}
+
+/* ─── Header ───────────────────────────────────────────────────────────── */
+
+.griddy-thead {
+  position: sticky;
+  top: 0;
+  z-index: 2;
+  background: var(--griddy-header-bg);
+  border-bottom: 2px solid var(--griddy-border-color);
+}
+
+.griddy-header-row {
+  display: flex;
+  width: 100%;
+}
+
+.griddy-header-cell {
+  display: flex;
+  align-items: center;
+  padding: var(--griddy-cell-padding);
+  height: 36px;
+  font-weight: 600;
+  color: var(--griddy-header-color);
+  border-right: 1px solid var(--griddy-border-color);
+  position: relative;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  user-select: none;
+  flex-shrink: 0;
+}
+
+.griddy-header-cell:last-child {
+  border-right: none;
+  flex: 1;
+}
+
+.griddy-header-cell--sortable {
+  cursor: pointer;
+}
+
+.griddy-header-cell--sortable:hover {
+  background: rgba(0, 0, 0, 0.04);
+}
+
+.griddy-header-cell--sorted {
+  color: var(--griddy-focus-color);
+}
+
+/* ─── Sort Indicator ───────────────────────────────────────────────────── */
+
+.griddy-sort-indicator {
+  margin-left: 4px;
+  font-size: 12px;
+}
+
+/* ─── Header Cell Content ──────────────────────────────────────────────── */
+
+.griddy-header-cell-content {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+  flex: 1;
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+/* ─── Filter Button ────────────────────────────────────────────────────── */
+
+.griddy-filter-button {
+  flex-shrink: 0;
+  opacity: 0.65;
+  transition: opacity 0.2s ease;
+}
+
+.griddy-filter-button:hover {
+  opacity: 0.85;
+}
+
+.griddy-filter-button--active {
+  opacity: 1;
+}
+
+/* ─── Resize Handle ────────────────────────────────────────────────────── */
+
+.griddy-resize-handle {
+  position: absolute;
+  right: 0;
+  top: 0;
+  bottom: 0;
+  width: 4px;
+  cursor: col-resize;
+  background: transparent;
+}
+
+.griddy-resize-handle:hover {
+  background: var(--griddy-focus-color);
+}
+
+/* ─── Body ─────────────────────────────────────────────────────────────── */
+
+.griddy-tbody {
+  width: 100%;
+}
+
+/* ─── Row ──────────────────────────────────────────────────────────────── */
+
+.griddy-row {
+  display: flex;
+  width: 100%;
+  border-bottom: 1px solid var(--griddy-border-color);
+  background: var(--griddy-row-bg);
+  cursor: default;
+  box-sizing: border-box;
+}
+
+.griddy-row:hover {
+  background: var(--griddy-row-hover-bg);
+}
+
+.griddy-row--even {
+  background: var(--griddy-row-even-bg);
+}
+
+.griddy-row--even:hover {
+  background: var(--griddy-row-hover-bg);
+}
+
+.griddy-row--focused {
+  outline: 2px solid var(--griddy-focus-color);
+  outline-offset: -2px;
+  z-index: 1;
+}
+
+.griddy-row--selected {
+  background-color: var(--griddy-selection-bg);
+}
+
+.griddy-row--selected:hover {
+  background-color: rgba(34, 139, 230, 0.15);
+}
+
+.griddy-row--focused.griddy-row--selected {
+  outline: 2px solid var(--griddy-focus-color);
+  background-color: var(--griddy-selection-bg);
+}
+
+/* ─── Cell ─────────────────────────────────────────────────────────────── */
+
+.griddy-cell {
+  display: flex;
+  align-items: center;
+  padding: var(--griddy-cell-padding);
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  border-right: 1px solid var(--griddy-border-color);
+  flex-shrink: 0;
+}
+
+.griddy-cell:last-child {
+  border-right: none;
+  flex: 1;
+}
+
+.griddy-cell--editing {
+  padding: 0;
+}
+
+/* ─── Checkbox ─────────────────────────────────────────────────────────── */
+
+.griddy-checkbox {
+  cursor: pointer;
+  margin: 0 auto;
+  display: block;
+}
+
+/* ─── Search Overlay ───────────────────────────────────────────────────── */
+
+.griddy-search-overlay {
+  position: absolute;
+  top: 0;
+  right: 0;
+  z-index: 10;
+  padding: 8px;
+  background: var(--griddy-search-bg);
+  border: 1px solid var(--griddy-search-border);
+  border-radius: 0 0 0 4px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+}
+
+.griddy-search-input {
+  font-size: var(--griddy-font-size);
+  padding: 4px 8px;
+  border: 1px solid var(--griddy-search-border);
+  border-radius: 4px;
+  outline: none;
+  width: 240px;
+}
+
+.griddy-search-input:focus {
+  border-color: var(--griddy-focus-color);
+  box-shadow: 0 0 0 2px rgba(34, 139, 230, 0.2);
+}
+
+/* ─── Pagination ───────────────────────────────────────────────────────── */
+
+.griddy-pagination {
+  border-top: 1px solid var(--griddy-border-color);
+  background: var(--griddy-header-bg);
+}
+
+/* ─── Infinite Scroll Loading ───────────────────────────────────────────── */
+
+.griddy-loading-indicator {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 16px;
+  background: var(--griddy-row-bg);
+  border-top: 1px solid var(--griddy-border-color);
+}
+
+.griddy-loading-spinner {
+  color: var(--griddy-focus-color);
+  font-size: var(--griddy-font-size);
+  font-weight: 500;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.griddy-loading-spinner::before {
+  content: '';
+  display: inline-block;
+  width: 16px;
+  height: 16px;
+  border: 2px solid var(--griddy-focus-color);
+  border-right-color: transparent;
+  border-radius: 50%;
+  animation: griddy-spin 0.6s linear infinite;
+}
+
+@keyframes griddy-spin {
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+/* ─── Column Pinning ─────────────────────────────────────────────────────── */
+
+.griddy-header-cell--pinned-left,
+.griddy-cell--pinned-left {
+  background: var(--griddy-header-bg);
+  box-shadow: 2px 0 4px rgba(0, 0, 0, 0.1);
+}
+
+.griddy-header-cell--pinned-right,
+.griddy-cell--pinned-right {
+  background: var(--griddy-header-bg);
+  box-shadow: -2px 0 4px rgba(0, 0, 0, 0.1);
+}
+
+.griddy-cell--pinned-left,
+.griddy-cell--pinned-right {
+  background: var(--griddy-row-bg);
+}
+
+.griddy-row:hover .griddy-cell--pinned-left,
+.griddy-row:hover .griddy-cell--pinned-right {
+  background: var(--griddy-row-hover-bg);
+}
+
+.griddy-row--selected .griddy-cell--pinned-left,
+.griddy-row--selected .griddy-cell--pinned-right {
+  background: var(--griddy-selection-bg);
+}
+
+/* ─── Data Grouping ──────────────────────────────────────────────────────── */
+
+.griddy-row--grouped {
+  background: var(--griddy-header-bg);
+  font-weight: 600;
+}
+
+/* ─── Column Reordering ──────────────────────────────────────────────────── */
+
+.griddy-header-cell--dragging {
+  opacity: 0.5;
+  cursor: grabbing !important;
+}
+
+.griddy-header-cell[draggable="true"] {
+  cursor: grab;
+}
+
+.griddy-header-cell[draggable="true"]:active {
+  cursor: grabbing;
+}
+
+/* ─── Error Boundary ──────────────────────────────────────────────────── */
+
+.griddy-error {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  padding: 32px 16px;
+  gap: 12px;
+  min-height: 200px;
+  background: #fff5f5;
+  border: 1px solid #ffc9c9;
+  border-radius: 4px;
+}
+
+.griddy-error-icon {
+  width: 40px;
+  height: 40px;
+  border-radius: 50%;
+  background: #ff6b6b;
+  color: #fff;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 20px;
+  font-weight: 700;
+}
+
+.griddy-error-message {
+  font-size: 16px;
+  font-weight: 600;
+  color: #c92a2a;
+}
+
+.griddy-error-detail {
+  font-size: 13px;
+  color: #868e96;
+  max-width: 400px;
+  text-align: center;
+  word-break: break-word;
+}
+
+.griddy-error-retry {
+  margin-top: 4px;
+  padding: 6px 16px;
+  font-size: 14px;
+  font-weight: 500;
+  color: #fff;
+  background: var(--griddy-focus-color, #228be6);
+  border: none;
+  border-radius: 4px;
+  cursor: pointer;
+}
+
+.griddy-error-retry:hover {
+  opacity: 0.9;
+}
+
+/* ─── Loading Skeleton ────────────────────────────────────────────────── */
+
+.griddy-skeleton {
+  width: 100%;
+}
+
+.griddy-skeleton-row {
+  display: flex;
+  width: 100%;
+  border-bottom: 1px solid var(--griddy-border-color);
+  align-items: center;
+}
+
+.griddy-skeleton-cell {
+  padding: var(--griddy-cell-padding);
+  flex-shrink: 0;
+  overflow: hidden;
+}
+
+.griddy-skeleton-bar {
+  height: 14px;
+  width: 70%;
+  background: linear-gradient(90deg, #e9ecef 25%, #f1f3f5 50%, #e9ecef 75%);
+  background-size: 200% 100%;
+  animation: griddy-shimmer 1.5s ease-in-out infinite;
+  border-radius: 3px;
+}
+
+@keyframes griddy-shimmer {
+  0% {
+    background-position: 200% 0;
+  }
+  100% {
+    background-position: -200% 0;
+  }
+}
+
+/* ─── Loading Overlay ─────────────────────────────────────────────────── */
+
+.griddy-loading-overlay {
+  position: absolute;
+  inset: 0;
+  background: rgba(255, 255, 255, 0.6);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 5;
+}
+
+/* ─── Renderers ───────────────────────────────────────────────────────── */
+
+.griddy-renderer-progress {
+  width: 100%;
+  height: 16px;
+  background: #e9ecef;
+  border-radius: 8px;
+  position: relative;
+  overflow: hidden;
+}
+
+.griddy-renderer-progress-bar {
+  height: 100%;
+  border-radius: 8px;
+  transition: width 0.3s ease;
+}
+
+.griddy-renderer-progress-label {
+  position: absolute;
+  inset: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 10px;
+  font-weight: 600;
+  color: #212529;
+}
+
+.griddy-renderer-badge {
+  display: inline-block;
+  padding: 2px 8px;
+  border-radius: 10px;
+  font-size: 12px;
+  font-weight: 500;
+  color: #fff;
+  white-space: nowrap;
+}
+
+.griddy-renderer-image {
+  display: block;
+  border-radius: 4px;
+  object-fit: cover;
+}
+
+.griddy-renderer-sparkline {
+  display: block;
+}
+
+/* ─── Quick Filter ────────────────────────────────────────────────────── */
+
+.griddy-quick-filter {
+  border-top: 1px solid var(--griddy-border-color);
+  padding-top: 8px;
+  margin-top: 4px;
+}
+
+/* ─── Advanced Search ─────────────────────────────────────────────────── */
+
+.griddy-advanced-search {
+  padding: 8px 12px;
+  background: var(--griddy-header-bg);
+  border-bottom: 1px solid var(--griddy-border-color);
+}
+
+/* ─── Search History ──────────────────────────────────────────────────── */
+
+.griddy-search-history {
+  margin-top: 4px;
+  padding: 4px 0;
+  border-top: 1px solid var(--griddy-border-color);
+}
+
+.griddy-search-history-item {
+  display: block;
+  width: 100%;
+  padding: 4px 8px;
+  font-size: 13px;
+  text-align: left;
+  background: none;
+  border: none;
+  cursor: pointer;
+  border-radius: 3px;
+  color: inherit;
+}
+
+.griddy-search-history-item:hover {
+  background: var(--griddy-row-hover-bg);
+}
+
+/* ─── Tree/Hierarchical Data ──────────────────────────────────────────────── */
+
+.griddy-tree-expand-button {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 20px;
+  height: 20px;
+  padding: 0;
+  margin-right: 4px;
+  background: none;
+  border: none;
+  cursor: pointer;
+  color: var(--mantine-color-gray-6, #868e96);
+  font-size: 10px;
+  flex-shrink: 0;
+  transition: color 0.15s ease;
+}
+
+.griddy-tree-expand-button:hover:not(:disabled) {
+  color: var(--mantine-color-gray-9, #212529);
+}
+
+.griddy-tree-expand-button:disabled {
+  cursor: wait;
+  opacity: 0.5;
+}
+
+.griddy-tree-expand-button:focus-visible {
+  outline: 2px solid var(--griddy-focus-color);
+  outline-offset: 2px;
+  border-radius: 2px;
+}
+
+/* Optional: Depth visual indicators */
+.griddy-row--tree-depth-1 .griddy-cell:first-child {
+  border-left: 2px solid var(--mantine-color-gray-3, #dee2e6);
+}
+
+.griddy-row--tree-depth-2 .griddy-cell:first-child {
+  border-left: 2px solid var(--mantine-color-blue-3, #74c0fc);
+}
+
+.griddy-row--tree-depth-3 .griddy-cell:first-child {
+  border-left: 2px solid var(--mantine-color-teal-3, #63e6be);
+}
+
+.griddy-row--tree-depth-4 .griddy-cell:first-child {
+  border-left: 2px solid var(--mantine-color-grape-3, #da77f2);
+}
+
+/* ─── Dark Mode ──────────────────────────────────────────────────────── */
+
+:global([data-mantine-color-scheme="dark"]) .griddy {
+  --griddy-border-color: #373a40;
+  --griddy-header-bg: #25262b;
+  --griddy-header-color: #c1c2c5;
+  --griddy-row-bg: #1a1b1e;
+  --griddy-row-hover-bg: #25262b;
+  --griddy-row-even-bg: #1a1b1e;
+  --griddy-focus-color: #339af0;
+  --griddy-selection-bg: rgba(51, 154, 240, 0.15);
+  --griddy-search-bg: #25262b;
+  --griddy-search-border: #373a40;
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-header-cell--sortable:hover {
+  background: rgba(255, 255, 255, 0.04);
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-row--selected:hover {
+  background-color: rgba(51, 154, 240, 0.2);
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-search-overlay {
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-search-input:focus {
+  box-shadow: 0 0 0 2px rgba(51, 154, 240, 0.25);
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-error {
+  background: #2c2e33;
+  border-color: #e03131;
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-error-message {
+  color: #ff6b6b;
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-error-detail {
+  color: #909296;
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-skeleton-bar {
+  background: linear-gradient(90deg, #373a40 25%, #2c2e33 50%, #373a40 75%);
+  background-size: 200% 100%;
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-loading-overlay {
+  background: rgba(0, 0, 0, 0.4);
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-renderer-progress {
+  background: #373a40;
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-renderer-progress-label {
+  color: #c1c2c5;
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-header-cell--pinned-left,
+:global([data-mantine-color-scheme="dark"]) .griddy-cell--pinned-left {
+  box-shadow: 2px 0 4px rgba(0, 0, 0, 0.3);
+}
+
+:global([data-mantine-color-scheme="dark"]) .griddy-header-cell--pinned-right,
+:global([data-mantine-color-scheme="dark"]) .griddy-cell--pinned-right {
+  box-shadow: -2px 0 4px rgba(0, 0, 0, 0.3);
+}

src/Gridler/GridlerDataGrid.tsx

@@ -7,7 +7,7 @@ import {
 } from '@glideapps/glide-data-grid';
 import { Group, Stack } from '@mantine/core';
 import { useElementSize, useMergedRef } from '@mantine/hooks';
-import React from 'react';
+import React, { useEffect } from 'react';
 
 import { BottomBar } from './components/BottomBar';
 import { Computer } from './components/Computer';
@@ -107,14 +107,22 @@ export const GridlerDataGrid = () => {
     setStateFN('_glideref', () => {
       return r ?? undefined;
     });
-
-    const ready = getState('ready');
-    const newReady = !!(r && mounted);
-    if (ready !== newReady) {
-      setState('ready', newReady);
-    }
   });
 
+  useEffect(() => {
+    if (ref.current && mounted) {
+      const currentReady = getState('ready');
+      if (!currentReady) {
+        setState('ready', true);
+      }
+    } else {
+      const currentReady = getState('ready');
+      if (currentReady) {
+        setState('ready', false);
+      }
+    }
+  }, [mounted, getState, setState]);
+
   const theme = useGridTheme();
 
   return (
@@ -158,7 +166,7 @@ export const GridlerDataGrid = () => {
             columns={(renderColumns as Array<GridColumn>) ?? []}
             columnSelect="none"
             drawFocusRing
-            height={height ?? 400}
+            height={height || 400}
             overscrollX={16}
             overscrollY={32}
             rangeSelect={allowMultiSelect ? 'multi-rect' : 'cell'}
@@ -188,6 +196,7 @@ export const GridlerDataGrid = () => {
               if (!refContextActivated.current) {
                 refContextActivated.current = true;
                 onContextClick('cell', event, cell[0], cell[1]);
+
                 setTimeout(() => {
                   refContextActivated.current = false;
                 }, 100);
@@ -231,7 +240,7 @@ export const GridlerDataGrid = () => {
                   rows = rows.hasIndex(r) ? rows : rows.add(r);
                 }
               }
-              console.log('Debug:onGridSelectionChange', currentSelection, selection);
+              //console.log('Debug:onGridSelectionChange', currentSelection, selection);
               if (
                 JSON.stringify(currentSelection?.columns) !== JSON.stringify(selection.columns) ||
                 JSON.stringify(currentSelection?.rows) !== JSON.stringify(rows) ||
@@ -275,7 +284,7 @@ export const GridlerDataGrid = () => {
 
             rows={total_rows ?? 0}
             theme={theme.gridTheme}
-            width={width ?? 200}
+            width={width || 200}
           />
         )}
 

src/Gridler/components/Computer.tsx

@@ -28,7 +28,7 @@ export const Computer = React.memo(() => {
     selectFirstRowOnMount,
     setState,
     setStateFN,
-    values
+    values,
   } = useGridlerStore((s) => ({
     _glideref: s._glideref,
     _gridSelectionRows: s._gridSelectionRows,
@@ -45,7 +45,7 @@ export const Computer = React.memo(() => {
     scrollToRowKey: s.scrollToRowKey,
     searchStr: s.searchStr,
     selectedRowKey: s.selectedRowKey,
-    selectFirstRowOnMount:s.selectFirstRowOnMount,
+    selectFirstRowOnMount: s.selectFirstRowOnMount,
     setState: s.setState,
     setStateFN: s.setStateFN,
     uniqueid: s.uniqueid,
@@ -71,13 +71,10 @@ export const Computer = React.memo(() => {
 
   //When values change, update selection
   useEffect(() => {
-    const searchSelection = async () => {
-      const page_data = getState('_page_data');
-      const pageSize = getState('pageSize');
+    const searchSelection = async (values: Array<Record<string, unknown>>) => {
       const keyField = getState('keyField') ?? 'id';
       const rowIndexes = [];
       for (const vi in values as Array<Record<string, unknown>>) {
-        let rowIndex = -1;
         const key = String(
           typeof values?.[vi] === 'object'
             ? values?.[vi]?.[keyField]
@@ -85,26 +82,12 @@ export const Computer = React.memo(() => {
               ? values?.[vi]
               : undefined
         );
-        for (const p in page_data) {
-          for (const r in page_data[p]) {
-            const idx = Number(p) * pageSize + Number(r);
-
-            if (String(page_data[p][r]?.[keyField]) === key) {
-              //console.log('Found row S', idx, page_data[p][r], page_data[p][r]?.[keyField], key);
-              rowIndex = idx;
-              break;
-            }
-          }
-          if (rowIndex >= 0) {
-            rowIndexes.push(rowIndex);
-            break;
-          }
+        if (!key) {
+          continue;
         }
-        if (!(rowIndex >= 0)) {
-          const idx = await getRowIndexByKey(key);
-          if (idx) {
-            rowIndexes.push(idx);
-          }
+        const idx = await getRowIndexByKey(key);
+        if (idx !== null && idx !== undefined) {
+          rowIndexes.push(idx);
         }
       }
 
@@ -112,10 +95,12 @@ export const Computer = React.memo(() => {
     };
 
     if (values) {
-      searchSelection().then((rowIndexes) => {
+      searchSelection(values).then((rowIndexes) => {
         let rows = CompactSelection.empty();
         rowIndexes.forEach((r) => {
-          rows = rows.add(r);
+          if (r !== undefined) {
+            rows = rows.add(r);
+          }
         });
 
         setStateFN('_gridSelectionRows', () => {
@@ -259,6 +244,7 @@ export const Computer = React.memo(() => {
       return;
     }
     if (refFirstRun.current > 0) {
+      getState('refreshCells')?.();
       return;
     }
     refFirstRun.current = 1;
@@ -276,10 +262,7 @@ export const Computer = React.memo(() => {
       const ready = getState('ready');
 
       if (ready && selectFirstRowOnMount) {
-
         const scrollToRowKey = getState('scrollToRowKey');
-        
-      
         if (scrollToRowKey && scrollToRowKey >= 0) {
           return;
         }
@@ -291,21 +274,18 @@ export const Computer = React.memo(() => {
         const firstRow = firstBuffer?.[keyField] ?? -1;
         const currentValues = getState('values') ?? [];
 
-        if (
-          !(values && values.length > 0) &&
-          firstRow &&
-          firstRow > 0 &&
-          (currentValues.length ?? 0) === 0
-        ) {
-          const values = [firstBuffer, ...(currentValues as Array<Record<string, unknown>>)];
+        if (!firstBuffer) {
+          return;
+        }
 
+        if (firstRow && firstRow > 0 && (currentValues.length ?? 0) === 0) {
+          const newValues = [firstBuffer];
 
           const onChange = getState('onChange');
-          //console.log('Selecting first row:', firstRow, firstBuffer, values);
           if (onChange) {
-            onChange(values);
+            onChange(newValues);
           } else {
-            setState('values', values);
+            setState('values', newValues);
           }
 
           setState('scrollToRowKey', firstRow);
@@ -318,7 +298,7 @@ export const Computer = React.memo(() => {
     return () => {
       _events?.removeEventListener('loadPage', loadPage);
     };
-  }, [ready, selectFirstRowOnMount]);
+  }, [ready, selectFirstRowOnMount, values]);
 
   /// logic to apply the selected row.
   // useEffect(() => {
@@ -348,10 +328,9 @@ export const Computer = React.memo(() => {
     const key = selectedRowKey ?? scrollToRowKey;
 
     if (key && ref && ready) {
+      //console.log('Computer:Scrolling to key:', key);
       getRowIndexByKey?.(key).then((r) => {
         if (r !== undefined) {
-          //console.log('Scrolling to selected row:', r, selectedRowKey, scrollToRowKey);
-
           if (selectedRowKey) {
             const onChange = getState('onChange');
             const selected = [{ [getState('keyField') ?? 'id']: selectedRowKey }];
@@ -379,15 +358,6 @@ export const Computer = React.memo(() => {
     }
   }, [scrollToRowKey, selectedRowKey]);
 
-  // console.log('Gridler:Debug:Computer', {
-  //   colFilters,
-  //   colOrder,
-  //   colSize,
-  //   colSort,
-  //   columns,
-  //   uniqueid
-  // });
-
   return <></>;
 });
 

src/Gridler/components/GridlerStore.tsx

@@ -140,7 +140,7 @@ export interface GridlerState {
   _visibleArea: Rectangle;
   _visiblePages: Rectangle;
   addError: (err: string, ...args: Array<any>) => void;
-  askAPIRowNumber?: (key: string) => Promise<number>;
+  askAPIRowNumber?: (key: string) => Promise<null | number>;
   colFilters?: Array<FilterOption>;
   colOrder?: Record<string, number>;
   colSize?: Record<string, number>;
@@ -162,7 +162,7 @@ export interface GridlerState {
   hasLocalData: boolean;
   isEmpty: boolean;
 
-  isValuesInPages: () => boolean
+  isValuesInPages: () => boolean;
   loadingData?: boolean;
   loadPage: (page: number, clearMode?: 'all' | 'page') => Promise<void>;
   mounted: boolean;
@@ -191,7 +191,6 @@ export interface GridlerState {
       freezeRegions?: readonly Rectangle[];
       selected?: Item;
     }
-
   ) => void;
 
   pageSize: number;
@@ -200,10 +199,7 @@ export interface GridlerState {
 
   reload?: () => Promise<void>;
   renderColumns?: GridlerColumns;
-  setState: <K extends keyof GridlerStoreState>(
-    key: K,
-    value: GridlerStoreState[K]
-  ) => void;
+  setState: <K extends keyof GridlerStoreState>(key: K, value: GridlerStoreState[K]) => void;
   setStateFN: <K extends keyof GridlerStoreState>(
     key: K,
     value: (current: GridlerStoreState[K]) => Partial<GridlerStoreState[K]>
@@ -340,7 +336,9 @@ const { Provider, useStore: useGridlerStore } = createSyncStore<GridlerStoreStat
     },
     getRowIndexByKey: async (key: number | string) => {
       const state = get();
-
+      if (key === undefined || key === null) {
+        return undefined;
+      }
       let rowIndex = -1;
       if (state.ready) {
         const page_data = state._page_data;
@@ -352,22 +350,22 @@ const { Provider, useStore: useGridlerStore } = createSyncStore<GridlerStoreStat
             //console.log('Found row', idx, page_data[p][r]?.[keyField], scrollToRowKey);
             if (String(page_data[p][r]?.[keyField]) === String(key)) {
               rowIndex =
-                page_data[p][r]?._rownumber > 0 ? page_data[p][r]?._rownumber : idx > 0 ? idx : -1;
+                page_data[p][r]?._rownumber > 0 ? page_data[p][r]?._rownumber : idx >= 0 ? idx : -1;
               break;
             }
           }
-          if (rowIndex > 0) {
-            console.log('Local row index', rowIndex, key);
+          if (rowIndex >= 0) {
+            //console.log('Local row index', rowIndex, key);
             return rowIndex;
           }
         }
 
-        if (rowIndex > 0) {
+        if (rowIndex >= 0) {
           return rowIndex;
         } else if (typeof state.askAPIRowNumber === 'function') {
           const rn = await state.askAPIRowNumber(String(key));
+
           if (rn && rn >= 0) {
-            console.log('Remote row index', rowIndex, key);
             return rn;
           }
         }
@@ -403,7 +401,7 @@ const { Provider, useStore: useGridlerStore } = createSyncStore<GridlerStoreStat
         }
       }
 
-      return false
+      return false;
     },
     keyField: 'id',
     loadPage: async (pPage: number, clearMode?: 'all' | 'page') => {
@@ -461,6 +459,8 @@ const { Provider, useStore: useGridlerStore } = createSyncStore<GridlerStoreStat
                 detail: { clearMode, data, page: pPage, state },
               })
             );
+
+            state.refreshCells();
           })
           .catch((e) => {
             console.error('loadPage Error: ', page, e);
@@ -488,13 +488,16 @@ const { Provider, useStore: useGridlerStore } = createSyncStore<GridlerStoreStat
     onCellClicked: (cell: Item, event: CellClickedEventArgs) => {
       const state = get();
       const [col, row] = cell;
+      const rowBuffer = state.getRowBuffer(row);
       if (state.glideProps?.onCellClicked) {
         state.glideProps?.onCellClicked?.(cell, event);
       }
-      if (state.values?.length) {
+      if (state.values?.length && state.values?.length > 0) {
         if (state.onChange) {
           state.onChange(state.values);
         }
+      } else if (rowBuffer && state.onChange) {
+        state.onChange([rowBuffer]);
       }
 
       state._events.dispatchEvent(
@@ -949,7 +952,7 @@ const { Provider, useStore: useGridlerStore } = createSyncStore<GridlerStoreStat
       }
     },
     total_rows: 1000,
-    uniqueid: getUUID()
+    uniqueid: getUUID(),
   }),
   (props) => {
     const [setState, getState] = props.useStore((s) => [s.setState, s.getState]);

src/Gridler/components/adaptors/GlidlerAPIAdaptorForGoLangv2.tsx

@@ -36,7 +36,7 @@ function _GlidlerAPIAdaptorForGoLangv2<T = unknown>(props: GlidlerAPIAdaptorForG
       const searchStr = getState('searchStr');
       const searchFields = getState('searchFields');
       const _active_requests = getState('_active_requests');
-       const keyField = getState('keyField');
+      const keyField = getState('keyField');
       setState('loadingData', true);
       try {
         //console.log('APIAdaptorGoLangv2', { _active_requests, index, pageSize, props });
@@ -83,7 +83,7 @@ function _GlidlerAPIAdaptorForGoLangv2<T = unknown>(props: GlidlerAPIAdaptorForG
               )
               ?.forEach((filter: any) => {
                 ops.push({
-                  name: `${filter.id ?? ""}`,
+                  name: `${filter.id ?? ''}`,
                   op: 'contains',
                   type: 'searchor',
                   value: searchStr,
@@ -202,11 +202,13 @@ function _GlidlerAPIAdaptorForGoLangv2<T = unknown>(props: GlidlerAPIAdaptorForG
     ]
   );
 
-  const askAPIRowNumber: (key: string) => Promise<number> = useCallback(
+  const askAPIRowNumber: (key: string) => Promise<null | number> = useCallback(
     async (key: string) => {
       const colFilters = getState('colFilters');
-
-      //console.log('APIAdaptorGoLangv2', { _active_requests, index, pageSize, props });
+      if (!key || key === '' || !props.url) {
+        return null;
+      }
+      //console.log('APIAdaptorGoLangv2', { key, props });
       if (props && props.url) {
         const head = new Headers();
         const ops: FetchAPIOperation[] = [
@@ -250,7 +252,7 @@ function _GlidlerAPIAdaptorForGoLangv2<T = unknown>(props: GlidlerAPIAdaptorForG
 
         const controller = new AbortController();
 
-        const res = await fetch(`${props.url}?x-fetch-rownumber=${key}}`, {
+        const res = await fetch(`${props.url}?x-fetch-rownumber=${key}`, {
           headers: head,
           method: 'GET',
           signal: controller?.signal,
@@ -265,7 +267,7 @@ function _GlidlerAPIAdaptorForGoLangv2<T = unknown>(props: GlidlerAPIAdaptorForG
       }
       return [];
     },
-    [props.url, props.authtoken, props.filter, props.options, getState, addError]
+    [props.url, props.authtoken, props.filter, JSON.stringify(props.options), getState, addError]
   );
 
   //Reset the function in the store.
@@ -276,7 +278,7 @@ function _GlidlerAPIAdaptorForGoLangv2<T = unknown>(props: GlidlerAPIAdaptorForG
 
     const _refresh = getState('_refresh');
     if (!isValuesInPages) {
-        setState('values', []);
+      setState('values', []);
     }
 
     //Reset the loaded pages to new rules
@@ -288,13 +290,13 @@ function _GlidlerAPIAdaptorForGoLangv2<T = unknown>(props: GlidlerAPIAdaptorForG
         onChange(buffers);
       }
     });
+
+    getState('refreshCells')?.();
   }, [props.url, props.authtoken, props.filter, JSON.stringify(props.options), mounted, setState]);
 
   return <></>;
 }
 
-
-
 //The computer component does not need to be recalculated on every render, so we use React.memo to prevent unnecessary re-renders.
 export const GlidlerAPIAdaptorForGoLangv2 = React.memo(_GlidlerAPIAdaptorForGoLangv2);
 

src/Gridler/components/adaptors/GlidlerFormAdaptor.tsx

@@ -61,7 +61,7 @@ export function GlidlerFormAdaptor(props: {
       col?: GridlerColumn,
       defaultItems?: MantineBetterMenuInstanceItem[]
     ): MantineBetterMenuInstanceItem[] => {
-      //console.log('GlidlerFormInterface getMenuItems', id);
+      //console.log('GlidlerFormInterface getMenuItems', id, row, defaultItems);
 
       if (id === 'header-menu') {
         return defaultItems || [];
@@ -88,7 +88,7 @@ export function GlidlerFormAdaptor(props: {
             ? props.descriptionField(row)
             : undefined;
 
-      if (id === 'other') {
+      if (id === 'other' || (id === 'cell' && !row)) {
         items.push({
           c: 'blue',
           label: 'Add',