Adopt TanStack Query fixes

src/providers/AuthProvider.test.tsx

@@ -2,6 +2,7 @@
 import React, { useContext, useState } from 'react';
 import { render, screen, waitFor, fireEvent, act } from '@testing-library/react';
 import { describe, it, expect, vi, beforeEach, type Mocked } from 'vitest';
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import { AuthProvider } from './AuthProvider';
 import { AuthContext } from '../contexts/AuthContext';
 import * as tokenStorage from '../services/tokenStorage';
@@ -59,11 +60,28 @@ const TestConsumer = () => {
   );
 };
 
+// Create a fresh QueryClient for each test to ensure isolation
+const createTestQueryClient = () =>
+  new QueryClient({
+    defaultOptions: {
+      queries: {
+        retry: false,
+        gcTime: 0,
+      },
+      mutations: {
+        retry: false,
+      },
+    },
+  });
+
 const renderWithProvider = () => {
+  const testQueryClient = createTestQueryClient();
   return render(
-    <AuthProvider>
-      <TestConsumer />
-    </AuthProvider>,
+    <QueryClientProvider client={testQueryClient}>
+      <AuthProvider>
+        <TestConsumer />
+      </AuthProvider>
+    </QueryClientProvider>,
   );
 };
 
@@ -198,7 +216,7 @@ describe('AuthProvider', () => {
     await waitFor(() => {
       // The error is now caught and displayed by the TestConsumer
       expect(screen.getByTestId('error-display')).toHaveTextContent(
-        'Login succeeded, but failed to fetch your data: Received null or undefined profile from API.',
+        'Login succeeded, but failed to fetch your data: API is down',
       );
 
       expect(mockedTokenStorage.setToken).toHaveBeenCalledWith('test-token-no-profile');

src/providers/AuthProvider.tsx

@@ -45,6 +45,12 @@ export const AuthProvider: React.FC<{ children: ReactNode }> = ({ children }) =>
       removeToken();
       setUserProfile(null);
       setAuthStatus('SIGNED_OUT');
+    } else if (token && isFetched && !fetchedProfile) {
+      // Token exists, query completed, but profile is null - sign out
+      logger.warn('[AuthProvider] Token was present but profile is null. Signing out.');
+      removeToken();
+      setUserProfile(null);
+      setAuthStatus('SIGNED_OUT');
     } else if (!token) {
       logger.info('[AuthProvider] No auth token found. Setting state to SIGNED_OUT.');
       setAuthStatus('SIGNED_OUT');