Pressing Q in game now cleans up the session and returns to lobby,
instead of calling tea.Quit which terminates the SSH connection and
shows "Connection lost" on web. Only Ctrl+C force-quits now.
Also cleans up room on exit so abandoned rooms don't persist in lobby.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>