fix(rectification): keep the adopt-card lock in state so lint can pass (BUG-622)

Writing selectionOfferLockRef during render tripped react-hooks/refs after the two contract tests went green. The lock now updates like seededTurns, and nextSelectionCardLock reuses the same object when the key is unchanged.

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

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

@@ -519,7 +519,7 @@ export function RectificationAgenticChat(props: RectificationAgenticChatProps) {
   const stepStartedAtRef = useRef(0);
   const liveToolRef = useRef<string | null>(null);
   const liveBaseLabelRef = useRef("正在处理…");
-  const selectionOfferLockRef = useRef<SelectionCardLock | null>(null);
+  const [selectionOfferLock, setSelectionOfferLock] = useState<SelectionCardLock | null>(null);
   const [compactBoard, setCompactBoard] = useState(false);
   const [boardOpen, setBoardOpen] = useState(false);
   const [boardDiff, setBoardDiff] = useState(() => diffRectificationBoard(null, null));
@@ -1458,14 +1458,19 @@ export function RectificationAgenticChat(props: RectificationAgenticChatProps) {
   const persistedOfferKey = [...messages].reverse().find((message) => message.candidateOffer)?.renderKey;
   const liveSelectionCardKey = persistedOfferKey
     ?? (canOfferCards && !candidateResult?.selectedTime ? latestSettledAssistant?.renderKey : undefined);
-  selectionOfferLockRef.current = nextSelectionCardLock(selectionOfferLockRef.current, {
+  // Same render-time store update as seededTurns: the lock must be current
+  // before this paint (BUG-620). A ref write here trips react-hooks/refs.
+  const nextOfferLock = nextSelectionCardLock(selectionOfferLock, {
     resultId: candidateResult?.resultId,
     key: liveSelectionCardKey,
   });
+  if (nextOfferLock !== selectionOfferLock) {
+    setSelectionOfferLock(nextOfferLock);
+  }
   const selectionCardMessageKey = resolveSelectionCardMessageKey({
     persistedOfferKey,
     fallbackKey: latestSettledAssistant?.renderKey,
-    locked: selectionOfferLockRef.current,
+    locked: nextOfferLock,
     resultId: candidateResult?.resultId,
     selectedTime: candidateResult?.selectedTime,
     canOffer: canOfferCards,

frontend/src/lib/rectification-agentic/v9/turn-question.ts

@@ -203,7 +203,10 @@ export function nextSelectionCardLock(
   input: { resultId: string | null | undefined; key: string | undefined },
 ): SelectionCardLock | null {
   if (!input.resultId) return null;
-  if (input.key) return { resultId: input.resultId, key: input.key };
+  if (input.key) {
+    if (current?.resultId === input.resultId && current.key === input.key) return current;
+    return { resultId: input.resultId, key: input.key };
+  }
   if (current?.resultId === input.resultId) return current;
   return null;
 }