[aaylward]

Change

Right-clicking a square toggles a red mark on it and suppresses the browser context menu. A left press on the board clears all marks, the way lichess does.

• Marks are client-only. Nothing is sent to the hub.
• They work off turn and for watchers.
• They're keyed to gameId, so they don't carry into the next game.
• They sit above the last-move and premove tints.

Not handled: on touch devices a long-press fires contextmenu, so it will mark the square too. That seemed harmless, so I left it.

Tests

• Component tests: toggle without a move or the browser menu, a left press clears but a right press doesn't, and marking works for a watcher but resets on a new game.
• Negative tests bite: removing the left-button check, and removing the gameId keying, each fail one test.
• typecheck, lint, the full test suite and build pass locally.
• Not tried in a real browser: the chess table needs the MoonBase backend. Please check on the Cloudflare preview.
• The four-agent review panel did not run.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	muchq	a2b1e71	Commit Preview URL Branch Preview URL	Oct 19 2026, 08:41 PM