fix: satisfy react purity lint in DraftPendingRefresh

Author: thribhuvan003

components/letters/DraftPendingRefresh.tsx

@@ -20,14 +20,15 @@ export function DraftPendingRefresh({ caseId, level }: { caseId: string; level:
   const router = useRouter();
   const [slow, setSlow] = useState(false);
   const [stuck, setStuck] = useState(false);
-  const startedAt = useRef(Date.now());
+  const startedAt = useRef<number | null>(null);
 
   useEffect(() => {
     let cancelled = false;
     let timer: ReturnType<typeof setTimeout>;
+    startedAt.current ??= Date.now();
 
     const tick = () => {
-      if (cancelled) return;
+      if (cancelled || startedAt.current === null) return;
       const elapsed = Date.now() - startedAt.current;
       if (elapsed > GIVE_UP_MS) {
         setStuck(true);