Update bookshelf page to use new generic saved filters endpoint
for persisting and loading user filter presets.
API Endpoint Changes:
- loadSavedFilters(): Use /api/saved-filters?resource_type=media-items
(OLD: /api/bookshelf/filters - removed endpoint)
- saveFilter(): Include resource_type: "media-items" in request body
Filter Persistence:
- Filters saved to backend instead of localStorage only
- Supports multiple resource types (extensible design)
- Maintains existing Alpine.js store integration
- Automatic reload after saving filters
User Experience:
- No breaking changes to UI
- Same save/load workflow for users
- Better data persistence (server-side storage)
- Cross-device filter sync (future enhancement)
Error Handling:
- Toast notifications for save success/failure
- Proper error logging to console
- Graceful handling of missing authentication
Migration:
- Fully backward compatible with existing UI
- No changes to HTML template needed
- Alpine store remains unchanged
Part of: Saved Filters Implementation (Phase 3: Frontend)
Related: #saved-filters-feature