feat: Phase 5 collaboration — real-time, workspaces, sharing, templates
Phase 5.1: Real-time Collaboration
- Yjs WebSocket server with document sync
- Fastify WebSocket endpoint at /ws/collab/:nodeId
- CollaborationClient for browser-side WebSocket management
- Automatic reconnection with 3s backoff
- Presence and cursor state broadcast
- Y-indexedDB for local persistence
Phase 5.2: Workspace & Team Management
- WorkspaceSwitcher component with dropdown
- Active workspace tracking
- Member avatar and role indicators
- New workspace creation flow
Phase 5.3: Sharing & Permissions
- Workspace data model with RBAC (owner, admin, editor, viewer)
- Activity tracking on all node mutations
Phase 5.4: Templates & Automation
- TemplatePicker with 5 built-in templates
- Meeting Notes, Daily Journal, Weekly Review, Project Plan, Event Plan
- Template preview with icon, name, description
- Type-based template filtering (note, task, event)
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