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/config/prompts/rah-easy.ts

@@ -20,6 +20,10 @@ Tool strategy:
 - youtubeExtract, websiteExtract, and paperExtract when outside content is required.
 - webSearch only when the knowledge base lacks the answer.
 
+Dimensions:
+- Create/lock dimensions to organize content using createDimension, lockDimension, updateDimension, unlockDimension, deleteDimension tools.
+- Lock dimensions (isPriority=true) so they auto-assign to new nodes.
+
 Response polish:
 - Default to minimal reasoning effort for speed.
 - Do not expose chain-of-thought; return conclusions only.