refactor(frontend): lint, one session guard, one request helper, one user context

src/pages/WishlistPage.test.jsx

@@ -2,6 +2,7 @@
 import {afterEach, beforeEach, describe, expect, it, vi} from 'vitest';
 import {cleanup, fireEvent, render, screen, waitFor} from '@testing-library/react';
 import {MemoryRouter, Route, Routes, useLocation} from 'react-router-dom';
+import RequireSession from '../components/RequireSession.jsx';
 import WishlistPage from './WishlistPage.jsx';
 import {PreferencesProvider} from '../context/PreferencesContext.jsx';
 
@@ -19,7 +20,7 @@ function LoginState() {
 const renderPage = () => render(
     <MemoryRouter initialEntries={['/wishlist']}><PreferencesProvider>
         <Routes>
-            <Route path="/wishlist" element={<WishlistPage/>}/>
+            <Route element={<RequireSession/>}><Route path="/wishlist" element={<WishlistPage/>}/></Route>
             <Route path="/login" element={<LoginState/>}/>
         </Routes>
     </PreferencesProvider></MemoryRouter>,