- Implement `/api/clusters/[id]/folders` endpoint for folder navigation with pagination and error handling
- Create ClusterFolderView component for folder tab UI with breadcrumb and cluster theming
- Enhance VirtualizedFolderGrid to support cluster API mode and handle cluster folder responses
- Integrate folder view as default tab on cluster page with navigation and state management
- Add comprehensive testing documentation and handle loading, empty, and error states in UI
- Add "Clusters" collapsible section in sidebar with color-coded icons
- Implement client cluster fetching and navigation links in sidebar
- Create cluster view page with header, stats cards, and tabbed media interface
- Integrate media player modals for video, photo, and text viewing
- Enhance InfiniteVirtualGrid to support custom API endpoints and response formats
- Refactor cluster API routes query params variable naming for consistency
- Add search and loading/error handling within cluster media pages
- Implement bookmark and rating functionality within cluster media grid
- Ensure responsive design and active state highlighting in sidebar and cluster pages
- Update library cluster progress documentation to reflect Phase 3 completion status
- Add database tables for clusters and library-cluster mappings with indexes
- Create REST API endpoints for cluster CRUD and library assignments
- Develop ClusterManagement component for create/edit/delete clusters with color/icon picker
- Implement multi-select library assignment and real-time statistics display
- Add LibraryClusterBadges component to show color-coded cluster badges on library cards
- Integrate cluster management UI into settings page with loading states and validation
- Enhance API input validation and error handling for cluster operations
- Document design decisions, performance considerations, and next steps for navigation features
- Define TypeScript interfaces for Cluster, ClusterWithStats, and LibraryClusterMapping
- Create clusters table with fields for name, description, color, icon, and timestamps
- Create library_cluster_mapping table to link libraries and clusters with foreign keys and unique constraint
- Add indexes on library_cluster_mapping and clusters tables for improved query performance
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