feat(ui): add maintenance page for task management

* Implement maintenance page with task and log display
* Add backfill and metadata retry functionality
* Integrate grid component for project display in thoughts page
* Update types for maintenance tasks and logs
* Enhance sidebar and shell for new maintenance navigation

ui/src/types.ts

@@ -2,10 +2,25 @@ export type AccessEntry = {
   key_id: string;
   last_accessed_at: string;
   last_path: string;
+  remote_addr: string;
   user_agent: string;
   request_count: number;
 };
 
+export type RequestAggregate = {
+  key: string;
+  request_count: number;
+};
+
+export type AccessMetrics = {
+  total_requests: number;
+  unique_principals: number;
+  unique_ips: number;
+  unique_agents: number;
+  top_ips: RequestAggregate[];
+  top_agents: RequestAggregate[];
+};
+
 export type StatusResponse = {
   title: string;
   description: string;
@@ -17,6 +32,7 @@ export type StatusResponse = {
   connected_window: string;
   oauth_enabled: boolean;
   entries: AccessEntry[];
+  metrics: AccessMetrics;
 };
 
 export type NavItem = {
@@ -26,7 +42,7 @@ export type NavItem = {
   disabled?: boolean;
 };
 
-export type ShellPage = 'dashboard' | 'projects' | 'thoughts' | 'skills' | 'guardrails' | 'files';
+export type ShellPage = 'dashboard' | 'projects' | 'thoughts' | 'learnings' | 'skills' | 'guardrails' | 'files' | 'maintenance';
 
 export type Project = {
   id: string;
@@ -49,10 +65,21 @@ export type ThoughtMetadata = {
   source: string;
   metadata_status: string;
   metadata_error?: string;
+  attachments?: ThoughtAttachment[];
+};
+
+export type ThoughtAttachment = {
+  file_id: string;
+  name: string;
+  media_type: string;
+  kind?: string;
+  size_bytes: number;
+  sha256?: string;
 };
 
 export type Thought = {
   id: string;
+  guid?: string;
   content: string;
   metadata: ThoughtMetadata;
   project_id?: string;
@@ -61,6 +88,14 @@ export type Thought = {
   updated_at: string;
 };
 
+export type ThoughtLink = {
+  id: number;
+  from_id: number;
+  to_id: number;
+  relation: string;
+  created_at: string;
+};
+
 export type SearchResult = {
   id: string;
   content: string;
@@ -109,3 +144,66 @@ export type ThoughtStats = {
   top_topics: { key: string; count: number }[];
   top_people: { key: string; count: number }[];
 };
+
+export type Learning = {
+  id: string;
+  summary: string;
+  details: string;
+  category: string;
+  area: string;
+  status: string;
+  priority: string;
+  confidence: string;
+  action_required: boolean;
+  source_type?: string;
+  source_ref?: string;
+  tags?: string;
+  project_id?: string;
+  related_thought_id?: string;
+  related_skill_id?: string;
+  reviewed_at?: string;
+  reviewed_by?: string;
+  created_at: string;
+  updated_at: string;
+};
+
+export type MaintenanceTask = {
+  id: string;
+  name: string;
+  category?: string;
+  priority: string;
+  frequency_days?: number;
+  next_due?: string;
+  last_completed?: string;
+  notes?: string;
+  created_at: string;
+  updated_at: string;
+};
+
+export type MaintenanceLog = {
+  id: string;
+  task_id: string;
+  completed_at: string;
+  performed_by?: string;
+  cost?: number;
+  notes?: string;
+  next_action?: string;
+};
+
+export type BackfillResult = {
+  model: string;
+  scanned: number;
+  embedded: number;
+  skipped: number;
+  failed: number;
+  dry_run: boolean;
+};
+
+export type MetadataRetryResult = {
+  scanned: number;
+  retried: number;
+  updated: number;
+  skipped: number;
+  failed: number;
+  dry_run: boolean;
+};