Add frontend components: dashboard, accounts, auth callback, and modal forms

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

frontend/src/store/authStore.ts

@@ -0,0 +1,31 @@
+import { create } from 'zustand';
+import { User } from '@/lib/api';
+
+interface AuthState {
+  user: User | null;
+  isAuthenticated: boolean;
+  isLoading: boolean;
+  setUser: (user: User | null) => void;
+  setLoading: (loading: boolean) => void;
+  logout: () => void;
+}
+
+export const useAuthStore = create<AuthState>((set) => ({
+  user: null,
+  isAuthenticated: false,
+  isLoading: true,
+  
+  setUser: (user) => set({ 
+    user, 
+    isAuthenticated: !!user,
+    isLoading: false,
+  }),
+  
+  setLoading: (loading) => set({ isLoading: loading }),
+  
+  logout: () => {
+    localStorage.removeItem('access_token');
+    localStorage.removeItem('user');
+    set({ user: null, isAuthenticated: false });
+  },
+}));