Move from Create React to Vite

web/src/pages/Activate.test.tsx

@@ -1,17 +1,18 @@
 import React from 'react';
 import { render, screen, fireEvent, waitFor } from '@testing-library/react';
+import { vi, type Mock } from 'vitest';
 import { MemoryRouter, Route, Routes } from 'react-router-dom';
 import Activate from './Activate';
 import { api } from '../api';
 import { AuthProvider } from '../auth';
 
-jest.mock('../api', () => ({
+vi.mock('../api', () => ({
   api: {
-    activate: jest.fn(),
+    activate: vi.fn(),
   },
 }));
 
-const mockActivate = api.activate as jest.Mock;
+const mockActivate = api.activate as Mock;
 
 function renderActivate(token = 'valid-token') {
   return render(