- Fix avformat_info duration: store in SAMPLES not ms (firmware uses this to
determine playback length; wrong units caused tracks to stop at ~3-11 seconds)
- Add Locations.itdb insert/delete for each track (ipod_path mapping)
- Add sync_locations_cbk() with HASHAB signing via WASM module
- Detect FirewireGuid from SysInfo for cbk header signature
- Add duplicate detection in add_track (title+artist match, skip if exists)
- Add get_orphaned_files() and delete_orphaned_files() for cleanup
- Sync cbk after every add/delete operation
- Add get_all_tracks() to load all tracks with file paths via tag matching
- Add delete_track() to remove tracks from SQLite DB and delete physical files
- Add _cleanup_orphaned_entries() to remove orphaned artist/album records
- Add track count label and 'Remove Selected' button to Transfer tab
- Load existing tracks on device detection
- Confirmation dialog before deleting tracks
- Reload track list after successful transfer
- Add extract_tags() to metadata_handler.py: reads tags from FLAC, MP3, OGG, M4A
- Support ID3v2 (MP3), Vorbis comments (FLAC/OGG), MP4 tags (M4A)
- Extract cover art from METADATA_BLOCK_PICTURE (FLAC), APIC (MP3), covr (M4A)
- Update _run_convert to use extract_tags instead of guessing from filename
- Fix tag reading in ipod_nano7_db.get_audio_info() using EasyID3 for MP3
- Create ipod_nano7_db.py module for Nano 7 SQLite DB management (Library.itdb)
- Fix case-insensitive iPod label detection in device detection
- Add /run/media to mount point search paths for Arch Linux
- Support already-mounted devices without requiring ifuse
- Add local file selection in Convert tab (FLAC, WAV, OGG, etc.)
- Transfer now properly registers tracks in iPod database so they appear in UI
