[dorklein]

When the microphone can't be used (permission denied, no device, the recorder fails to start), tapping the record button does nothing visible. ChatInput awaits WaveformRecorderController.startRecording() and stopRecording() with no error handling, so the error escapes as an uncaught async error and the app gets no chance to tell the user.

Change

• ChatInput catches errors from startRecording() and stopRecording() and hands them to LlmChatView.
• New optional LlmChatView.onRecordingErrorCallback(BuildContext context, Object error), next to onErrorCallback and onCancelCallback and following the same pattern. If it isn't set, the chat shows a snackbar with strings.unableToRecordAudio, which is what the stop path already shows when no file was recorded.

Apps that want their own message, or want to log the error, pass the callback. Everyone else now gets the existing localized "Unable to record audio" message.

Test

test/voice_recording_error_test.dart mocks the record method channel so the microphone permission is refused, taps Record Audio, and checks that:

• the default snackbar is shown, and
• onRecordingErrorCallback receives the error and replaces the snackbar.

Depends on csells/waveform_recorder#13 and #14. With waveform_recorder 1.8.1 (the current release), a failed start leaves the controller in the recording state. The next rebuild of the chat input then throws Exception: Not recording from amplitudeStream, so this test fails on 1.8.1 for that reason, not because of this change. #13 leaves the controller idle after a failed start, and #14 makes a refused permission fail the start. With both (I ran it with a dependency_overrides on a branch that has them), the new tests and the existing ones pass, and dart analyze --fatal-infos and dart format are clean. Once they're released, the waveform_recorder constraint here can move to that version; I'm happy to add that bump to this PR.

🤖 Generated with Claude Code

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