CodeQuest v1.0.4

Fixes

• Video can start even when the microphone is unavailable.
• Remote signaling failures no longer hide the working local camera preview.
• Stale peer-close events cannot remove a replacement WebRTC connection.
• Video playback retries when stream metadata becomes available.
• Single-participant video uses the full grid and includes clear status/retry guidance.
• TURN configuration supports multiple endpoints and TCP fallback.
• Run now says "Completed successfully" instead of implying solution acceptance; Submit remains the correctness check.

Verification

• Two isolated Chrome participants exchanged live 640x480 local and remote audio/video streams.
• Backend tests and TypeScript checks passed.
• Frontend TypeScript, ESLint, and production build passed.
• GitHub Actions TypeScript, Vercel, and Render jobs passed.