sync: features from private repo (2025-12-24)

Synced from ra-h private repo:
- Collapsible chat panel (Cmd+\)
- FolderViewOverlay with Kanban/Grid/List views
- Updated agent prompts
- Improved executor and quickAdd services
- New views.ts types

Files kept at OS versions (auth/backend deps):
- SettingsModal, RAHChat, useSSEChat
- Delegation tools and wiseRAHExecutor
- openExternalUrl (no Tauri)

Added stub: supabaseTokenRegistry.ts for compatibility

src/types/database.ts

@@ -171,3 +171,11 @@ export interface DatabaseError {
   code?: string;
   details?: any;
 }
+
+// Dimension interface for dimension management
+export interface Dimension {
+  name: string;
+  description?: string | null;
+  is_priority: boolean;
+  updated_at: string;
+}