The backgammon game never entered game mode, so the HUD and the dock
stayed over the board (screenshots only hid it when an earlier game had
left game mode on). It now enters on mount and exits on unmount like the
other games. Avatars follow one rule across games: a person is a purple
rounded square on a lip, a bot an ink rounded square with the robot
(chess's player tile was blue, backgammon's were circles).
backgammon.mjs --only result,layout: 27/27.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>