- Add xdg_cache_path() utility respecting
- CoverCache now stores covers in ~/.cache/neo-pod-desktop/covers/
- MetadataHandler temp files in ~/.cache/neo-pod-desktop/thumbnails/
- Survives reboot, no more lost cover_path during process_file
- Change ithmb file open from 'wb' (truncate) to 'ab' (append)
- Compute write offset from actual file position via seek(0,2)
- Prevents losing all previous artwork data on each transfer
- New src/artwork/ module with iPod Nano 7G cover art support
- codecs: RGB565/RGB555/UYVY/JPEG encode/decode via numpy
- presets: 50+ iPod artwork format definitions
- chunks: ArtworkDB binary parser/writer (MHFD→MHSD→MHLI→MHII→MHNI)
- writer: ithmb file generation + ArtworkDB assembly
- extractor: cover extraction from audio files (APIC/covr/FLAC pictures)
- cache: local JPEG cache for player UI
- iTunes-style playback bar with 60x60 cover art display
- Scan library now caches cover art by artist+album
- iPod Nano7 transfer writes artwork to ArtworkDB + ithmb
- FFmpeg conversion preserves embedded cover art (-map 0:t?)
- One-time reembed_covers.py script in /tmp
- MetadataHandler process_file() fallback to cover_path
- Bug fixes: missing read_existing_artwork import, signed PID in Q format
