fix(web): stop writing choice-card visibility into a ref during render

Staging lint failed on react-hooks/refs after the jump overlay fix.
Keep the latest card-open flag in the existing layout effect so ESLint
passes and the overlay still stays off the choice card.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/rectification-agentic-chat.tsx

@@ -983,8 +983,8 @@ export function RectificationAgenticChat(props: RectificationAgenticChatProps) {
     && !readonly
     && regeneratingMessageKey === null,
   );
-  choiceCardsOpen.current = showChoiceCards;
   useLayoutEffect(() => {
+    choiceCardsOpen.current = showChoiceCards;
     updateFollowState();
   }, [showChoiceCards, updateFollowState]);
   const showSelectionCards = Boolean(