Auto-enable was a no-op
- Writing 'visualizerEnabled'='true' to localStorage from app.js did
not update the exported `let visualizerEnabled` in player.js. So
applyVisualizerMode() saw the stale `false` and went into the
DISABLE branch — leaving the device 'available, not capturing'.
- Add a setVisualizerEnabled() setter exported from player.js and
call it before applyVisualizerMode() during boot.
Audio device persistence
- Save the selected device name to localStorage on change.
- On loadAudioDevices(), prefer status.current_device (server's
current state) but fall back to the localStorage value if the
server doesn't know one (e.g. after a server restart).
- If the saved device wasn't recognized by the server, push it back
via POST /api/media/visualizer/device so capture lands on it
immediately. Best-effort; no toast on failure.
alexei.dolgolyov
6066b4a2c5