Swapping sides moves every player to the other block. Unkeyed, the rows
stayed put and took on other players, and stopping a watch after a swap
then closed the app on Windows (in the accessibility bridge, with a tool
reading the window). Keyed by player, it doesn't.

The watched agent is now drawn after everyone else, so a dimmed agent
standing on them no longer hides them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>