Refactorings:
- Extract HTMLImageEmbedder and HTMLImageExtractor utilities
- Create UseCases for cached data access (GetCachedBookmarksUseCase, GetCachedArticleUseCase)
- Create CreateAnnotationUseCase to remove API dependency from ViewModel
- Simplify CachedAsyncImage by extracting helper methods
- Fix Kingfisher API compatibility (Source types, Result handling)
- Add documentation to OfflineCacheSyncUseCase
- Remove unused TestView from production code
Enforces Clean Architecture:
- ViewModels now only use UseCases, no direct Repository or API access
- All data layer access goes through Domain layer
