- Add protocols for all UseCases and implement them in their respective classes
- Add DefaultUseCaseFactory and MockUseCaseFactory for dependency injection
- Implement all mock UseCases with dummy data
- Start migration of view models and views to protocol-based UseCase injection (not all migrated yet)
- Refactor previews and some initializers for easier testing
- Move SectionHeader to Components, update server settings UI text
- Add sample article.html for mock content
- BookmarkDetail: Add labels property, display and manage labels in detail view
- Add AddLabelsToBookmarkUseCase and RemoveLabelsFromBookmarkUseCase
- Update UpdateBookmarkUseCase and BookmarkUpdateRequest for label operations
- UI: Show labels in BookmarkDetailView, add label management sheet
- DefaultUseCaseFactory: Provide use cases for label management
- Localizable: Add/adjust label-related strings, minor cleanup
- SettingsServerView: Update debug endpoint
- SidebarTab: Change 'Alle' to 'All'
- Project: Remove unused region from Xcode project
