Fix ConfirmButton Enter/Space keydown bubbling to parent row handler

The button's onClick stopped mouse event propagation, but keyboard
Enter/Space fired a separate keydown event that bubbled to the
combatant row's onKeyDown, opening the stat block side panel instead
of arming/confirming the button.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/components/ui/confirm-button.tsx

@@ -67,6 +67,12 @@ export function ConfirmButton({
 		};
 	}, [isConfirming, revert]);
 
+	const handleKeyDown = useCallback((e: React.KeyboardEvent) => {
+		if (e.key === "Enter" || e.key === " ") {
+			e.stopPropagation();
+		}
+	}, []);
+
 	const handleClick = useCallback(
 		(e: React.MouseEvent) => {
 			e.stopPropagation();
@@ -95,6 +101,7 @@ export function ConfirmButton({
 						"bg-destructive text-primary-foreground rounded-md animate-confirm-pulse hover:bg-destructive hover:text-primary-foreground",
 				)}
 				onClick={handleClick}
+				onKeyDown={handleKeyDown}
 				onBlur={revert}
 				disabled={disabled}
 				aria-label={isConfirming ? `Confirm ${label.toLowerCase()}` : label}