- 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
