- Add LinkHealthCheckWorker for automated bi-daily link validation (12-hour intervals)
- Extend LinkEntity with isDeadLink and lastHealthCheck fields for tracking link status
- Create LinkDao queries for dead link retrieval and health status updates
- Implement getDeadLinksStream() in LinkRepository for paginated dead link viewing
- Add GeminiRepository.generateTags() method with model fallback strategy and
- Add extensive documentation for offline mode, sync, collections, and dashboard features
- Document new Material You theming, OLED mode, and widget capabilities
- Include detailed sections on metadata extraction, Markdown editor, and import/export
- Update technology stack versions (Kotlin 2.0.0, Hilt 2.51.1, Retrofit 2.11.0, Room 2.6.1)
- Simplify installation and compilation instructions
- Add user guide with first-time setup and
