Convert hw:X,0 to front:CARD=name,DEV=0 format when saving device selection.
This makes device IDs stable across reboots and USB reconnections since they
use the card name (e.g., C20) instead of the card number which can change.
- Add normalize_device_id_to_stable() to convert hw:X,0 to front:CARD=name,DEV=0
- Add resolve_stable_to_current_hw() for reverse lookup when needed
- Apply normalization automatically in set_audio_output_device command
- Export functions from audio module for use across codebase
vicrodh
9b12f761b5