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(

frontend/tests/rectification-agentic-entry.test.ts

@@ -278,6 +278,11 @@ test("Agentic rectification follows the conversation tail only while the reader
   assert.match(chat, /top: viewport\.scrollHeight/);
   assert.match(chat, /shouldShowJumpToLatest/);
   assert.match(chat, /choiceCardsOpen/);
+  assert.match(
+    chat,
+    /useLayoutEffect\(\(\) => \{\s*choiceCardsOpen\.current = showChoiceCards;\s*updateFollowState\(\);\s*\}, \[showChoiceCards, updateFollowState\]\)/,
+  );
+  assert.doesNotMatch(chat, /choiceCardsOpen\.current = showChoiceCards;\s*useLayoutEffect/);
   assert.match(chat, /updateFollowState/);
   assert.match(chat, /\}, \[busy, candidateResult, choiceCard, error, messages, savedTime, followLatestContent\]\);/);
   assert.match(styles, /\.rectification-jump-latest \{[\s\S]*justify-content: flex-end/);