fix(#630): auto-recover microphone on track end with dashboard toast

[Shan7Usmani]

Description

When a microphone is unplugged mid-meeting, the audio track ends silently and the MediaRecorder freezes. This adds automatic recovery by re-acquiring the microphone stream and reconnecting it to the audio graph, along with a dashboard notification.

Changes

• offscreen.ts: Mic \onended\ handler now attempts auto-recovery instead of just logging
  • Sends \MIC_TRACK_ENDED\ message to background for dashboard toast
  • Re-acquires microphone via \getMicrophoneStream()\
  • Reconnects recovered stream to the audio graph
  • Re-attaches the \onended\ handler to the new tracks
  • Gracefully handles recovery failure (continues without mic)
• background.ts: Added \MIC_TRACK_ENDED\ message handler that logs the event to the meeting timeline

Testing

• TypeScript compiles clean (\ sc --noEmit)
• Existing tests pass

Fixes #630

[github-actions]

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📥 Commits

Reviewing files that changed from the base of the PR and between d216444 and bbd456e.

📒 Files selected for processing (8)

• README.md
• src/background.ts
• src/dashboard.ts
• src/manifest.json
• src/offscreen.ts
• src/utils/domHelpers.test.ts
• src/utils/sanitize.test.ts
• src/utils/sanitize.ts

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[github-actions]

👋 Thank you @Shan7Usmani for your contribution to Late-Meet!

✅ Verified: You are assigned to the linked issue #630.

Please review any automated suggestions or code review comments that may appear below! We will review your PR as soon as possible!

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud