fix and update

apps/frontend/lib/pin-idle-storage.ts

@@ -0,0 +1,35 @@
+import { AUTH_USER_CACHE_KEY } from '@/lib/api';
+
+const PIN_IDLE_WATCH_KEY = 'auth:pin-idle-watch-user';
+
+function readCachedUserId(): string | null {
+  if (typeof window === 'undefined') return null;
+  const raw = window.localStorage.getItem(AUTH_USER_CACHE_KEY);
+  if (!raw) return null;
+  try {
+    const parsed = JSON.parse(raw) as { id?: string };
+    return parsed.id ?? null;
+  } catch {
+    return null;
+  }
+}
+
+export function markPinIdleWatch(userId?: string | null) {
+  if (typeof window === 'undefined') return;
+  const resolvedUserId = userId ?? readCachedUserId();
+  if (!resolvedUserId) return;
+  window.localStorage.setItem(PIN_IDLE_WATCH_KEY, resolvedUserId);
+}
+
+export function clearPinIdleWatch() {
+  if (typeof window === 'undefined') return;
+  window.localStorage.removeItem(PIN_IDLE_WATCH_KEY);
+}
+
+export function isPinIdleWatchActive(userId?: string | null) {
+  if (typeof window === 'undefined') return false;
+  const stored = window.localStorage.getItem(PIN_IDLE_WATCH_KEY);
+  if (!stored) return false;
+  const resolvedUserId = userId ?? readCachedUserId();
+  return Boolean(resolvedUserId && stored === resolvedUserId);
+}