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Guard AudioRecordingService.WarmUp() and StartPreview() against zero audio devices with early-return and try-catch. Add DeviceAvailable event and HasDevice property for auto-recovery via existing 2s polling timer. Show user-visible feedback when no microphone is connected and when one becomes available again.
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Summary
AudioRecordingService.WarmUp()andStartPreview()against zero audio input devices with early-return checks and try-catch, preventing the app from freezing when no microphone is connected.HasDeviceproperty andDeviceAvailableevent for automatic recovery when a microphone is plugged in (detected via existing 2-second polling timer).Test plan