Update GPT and add Profile

frontend/src/App.tsx

@@ -17,6 +17,9 @@ import { PlayPage } from '@/pages/PlayPage'
 import { LeaderboardPage } from '@/pages/LeaderboardPage'
 import { InvitePage } from '@/pages/InvitePage'
 import { AssignmentDetailPage } from '@/pages/AssignmentDetailPage'
+import { ProfilePage } from '@/pages/ProfilePage'
+import { UserProfilePage } from '@/pages/UserProfilePage'
+import { NotFoundPage } from '@/pages/NotFoundPage'
 
 // Protected route wrapper
 function ProtectedRoute({ children }: { children: React.ReactNode }) {
@@ -132,6 +135,21 @@ function App() {
             </ProtectedRoute>
           }
         />
+
+        {/* Profile routes */}
+        <Route
+          path="profile"
+          element={
+            <ProtectedRoute>
+              <ProfilePage />
+            </ProtectedRoute>
+          }
+        />
+
+        <Route path="users/:id" element={<UserProfilePage />} />
+
+        {/* 404 - must be last */}
+        <Route path="*" element={<NotFoundPage />} />
       </Route>
     </Routes>
     </>