fix(e2e): resolve lint error, Dashboard auth gap, and mock auth redirect

- Remove unused `response` variable in j8-unauth-access.spec.ts:40
- Move Dashboard route inside ProtectedRoute wrapper in App.tsx
- Add VITE_MOCK_AUTH mode to ProtectedRoute: check Zustand
  isAuthenticated flag instead of calling authClient.useSession()

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/App.tsx

@@ -31,8 +31,8 @@ export default function App() {
       <BrowserRouter>
         <Routes>
           <Route element={<Layout />}>
-            <Route index element={<Dashboard />} />
             <Route element={<ProtectedRoute />}>
+              <Route index element={<Dashboard />} />
               <Route path="purchases" element={<Purchases />} />
               <Route path="purchases/:id" element={<PurchaseDetail />} />
               <Route path="products" element={<Products />} />