add frontend and change password

frontend/src/store/authStore.ts

@@ -0,0 +1,25 @@
+import { create } from 'zustand';
+
+interface User {
+  id: string;
+  email: string;
+  username: string;
+}
+
+interface AuthStore {
+  user: User | null;
+  isAuthenticated: boolean;
+  isLoading: boolean;
+  setUser: (user: User | null) => void;
+  setLoading: (loading: boolean) => void;
+  logout: () => void;
+}
+
+export const useAuthStore = create<AuthStore>((set) => ({
+  user: null,
+  isAuthenticated: false,
+  isLoading: true,
+  setUser: (user) => set({ user, isAuthenticated: !!user, isLoading: false }),
+  setLoading: (loading) => set({ isLoading: loading }),
+  logout: () => set({ user: null, isAuthenticated: false }),
+}));