feat(ui): add origin-style admin shell scaffold

ui/src/shellState.ts

@@ -0,0 +1,46 @@
+import { GlobalStateStore } from '@warkypublic/svelix';
+
+const normalizeApiURL = (url: string): string => url.replace(/\/+$/, '');
+
+const resolveApiURL = (envURL?: string): string => {
+  const viteEnvURL =
+    envURL?.trim() ||
+    import.meta.env.VITE_API_URL?.trim() ||
+    import.meta.env.VITE_API_BASE_URL?.trim() ||
+    import.meta.env.VITE_URL?.trim();
+
+  if (viteEnvURL) return normalizeApiURL(viteEnvURL);
+
+  if (typeof window !== 'undefined') {
+    return `${window.location.protocol}//${window.location.host}/api`;
+  }
+
+  const stateURL = GlobalStateStore.getState().session.apiURL?.trim();
+  if (stateURL) return normalizeApiURL(stateURL);
+
+  return '';
+};
+
+export { GlobalStateStore };
+
+export function ensureApiURL(envURL?: string): string {
+  const resolved = resolveApiURL(envURL);
+  if (!resolved) return '';
+
+  const state = GlobalStateStore.getState();
+  if (state.session.apiURL !== resolved) {
+    state.setApiURL(resolved);
+  }
+
+  return resolved;
+}
+
+export function setCurrentPath(pathname: string): void {
+  const state = GlobalStateStore.getState();
+  const current = state.navigation.currentPage ?? {};
+
+  state.setCurrentPage({
+    ...current,
+    path: pathname
+  });
+}