se.cherkasov e113c53fb7 feat(desktop): replace audio stub with cpal backend and volume slider ...

- CpalAudioSink writes to SPSC ring buffer, cpal callback reads
- Graceful fallback to silent operation on audio device errors
- Volume slider (0-100%) in header bar with speaker icon
- Ring buffer cleared on ROM load and reset

2026-03-13 16:21:25 +03:00

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