- **Metadata Extraction**:
    - Introduce `readWithJAudioTagger` as a fallback mechanism in `AudioMetadataReader` when `TagLib` fails to retrieve essential tags (title/artist).
    - Add diagnostic logging to `AudioMetadataReader` to track `TagLib` property mapping and fallback triggers.
    - Implement `isDefaultMetadata` check in `SyncWorker` to identify files with placeholder MediaStore metadata (e.g., `<unknown>`, "Unknown Artist").
    - Expand metadata augmentation logic in `SyncWorker` to trigger file-based tag reading if MediaStore returns default/missing values.
- **Dependencies & Configuration**:
    - Add `jaudiotagger` dependency to `build.gradle.kts` to handle non-standard ID3 frames and specific encoding edge cases (e.g., 48kHz MP3s from ffmpeg).
    - Update `proguard-rules.pro` to preserve `org.jaudiotagger` classes.
- **Data Management**:
    - Ensure unified metadata consistency by falling back to JAudioTagger for various fields including album artist, track number, bitrate, and artwork.