Add AuthCallback component for handling authentication status and redirection

src/main.tsx

@@ -12,6 +12,7 @@ import Friends from './pages/Friends.tsx'
 import Blog from './pages/Blog.tsx'
 import Servers from './pages/Servers.tsx'
 import Forum from './pages/Forum.tsx'
+import AuthCallback from './pages/AuthCallback.tsx'
 
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
@@ -26,6 +27,7 @@ createRoot(document.getElementById('root')!).render(
               <Route path="/blog" element={<Blog />} />
               <Route path="/servers" element={<Servers />} />
               <Route path="/forum" element={<Forum />} />
+              <Route path="/auth/callback" element={<AuthCallback />} />
             </Routes>
           </Router>
         </ServerProvider>