MAESTRO: add analysis cache hook

frontend/vitest.setup.ts

@@ -0,0 +1,52 @@
+const createLocalStorageMock = () => {
+  let store = new Map<string, string>();
+
+  return {
+    get length() {
+      return store.size;
+    },
+    clear() {
+      store.clear();
+    },
+    getItem(key: string) {
+      return store.has(key) ? store.get(key) ?? null : null;
+    },
+    key(index: number) {
+      if (index < 0 || index >= store.size) {
+        return null;
+      }
+      return Array.from(store.keys())[index] ?? null;
+    },
+    removeItem(key: string) {
+      store.delete(key);
+    },
+    setItem(key: string, value: string) {
+      store.set(String(key), String(value));
+    },
+  };
+};
+
+const ensureLocalStorage = () => {
+  const target = typeof window !== "undefined" ? window : globalThis;
+  const current = target.localStorage as Storage | undefined;
+
+  if (!current || typeof current.clear !== "function") {
+    const mock = createLocalStorageMock();
+    Object.defineProperty(target, "localStorage", {
+      value: mock,
+      configurable: true,
+      enumerable: true,
+      writable: false,
+    });
+    if (target !== globalThis) {
+      Object.defineProperty(globalThis, "localStorage", {
+        value: mock,
+        configurable: true,
+        enumerable: true,
+        writable: false,
+      });
+    }
+  }
+};
+
+ensureLocalStorage();