CodeQuest v1.0.3

Fixed

• Language changes now wait for server confirmation and are serialized per room
• Yjs packets carry a room/language/problem document key, preventing delayed
  packets from inserting one language's code into another editor
• Superseded document sync requests can no longer replace the active document
• Video starts only after the Socket.IO room join is confirmed
• Camera state resets correctly when reopening a call, stream-less WebRTC tracks
  are handled, and blocked autoplay can be resumed from the video tile
• Camera and microphone failures now show actionable permission/device errors