- Created useOfflineSync hook for connectivity detection and sync management
- Implemented localStorage-based mutation queue for offline operations
- Added background sync support in service worker
- Created OfflineIndicator component to show connection status
- Added offline-aware action wrappers for seamless offline/online transitions
- Implemented conflict handling with retry logic (up to 3 retries)
- Auto-sync when connection is restored
- Validates Requirements 4.5
- Created useSearch hook for search state and debouncing
- Created useFilters hook for filter state management
- Created useOptimisticUpdate hook for optimistic UI updates
- Created useScrollPosition hook for scroll preservation
- Updated SearchBar, GlobalSearch, and ListDetailView to use new hooks
- Added comprehensive documentation for all hooks
Validates: Requirements 6.4, 7.3, 7.4, 8.3
Task: 9. Implement client-side state management
