fix delay material fetching

client/src/app/shared/helpers/asyncStorage.ts

@@ -0,0 +1,14 @@
+export class AsyncStorage {
+  static async getItem<T>(key: string) {
+    return new Promise<T>((resolve) => {
+      resolve(localStorage.getItem(key) as T);
+    });
+  }
+
+  static async setItem(key: string, value: string) {
+    return new Promise<void>((resolve) => {
+      localStorage.setItem(key, value);
+      resolve();
+    });
+  }
+}