Major improvements to offline reading functionality:
**Hero Image Offline Support:**
- Add heroImageURL field to BookmarkEntity for persistent storage
- Implement ImageCache-based caching with custom keys (bookmark-{id}-hero)
- Update CachedAsyncImage to support offline loading via cache keys
- Hero images now work offline without URL dependency
**Offline Bookmark Loading:**
- Add proactive offline detection before API calls
- Implement automatic fallback to cached bookmarks when offline
- Fix network status initialization race condition
- Network monitor now checks status synchronously on init
**Core Data Enhancements:**
- Persist hero image URLs in BookmarkEntity.heroImageURL
- Reconstruct ImageResource from cached URLs on offline load
- Add extensive logging for debugging persistence issues
**UI Updates:**
- Update BookmarkDetailView2 to use cache keys for hero images
- Update BookmarkCardView (all 3 layouts) with cache key support
- Improve BookmarksView offline state handling with task-based loading
- Add 50ms delay for network status propagation
**Technical Details:**
- NetworkMonitorRepository: Fix initial status from hardcoded true to actual network check
- BookmarksViewModel: Inject AppSettings for offline detection
- OfflineCacheRepository: Add verification logging for save/load operations
- BookmarkEntityMapper: Sync heroImageURL on save, restore on load
This enables full offline reading with hero images visible in bookmark lists
and detail views, even after app restart.
Create separate cache repository layer:
- Add POfflineCacheRepository protocol for cache operations
- Add OfflineCacheRepository with CoreData and Kingfisher
- Add OfflineCacheSyncUseCase to coordinate sync workflow
- Update PBookmarksRepository to focus on API calls only
- Extend BookmarkEntityMapper with toDomain() conversion
UseCase coordinates between cache, API, and settings repositories
following dependency inversion principle.
