Enhance authentication flow by implementing ProtectedRoute component across various pages, ensuring users are redirected based on their authentication status. Update login page to support Google sign-in and handle redirect URLs after login. Modify analytics and links pages to include loading indicators and protected access. Update next.config.ts to enable middleware for edge functions.

app/page.tsx

@@ -1,5 +1,32 @@
-import { redirect } from 'next/navigation';
+'use client';
+
+import { useEffect } from 'react';
+import { useRouter } from 'next/navigation';
+import { useAuth } from '@/lib/auth';
 
 export default function Home() {
-  redirect('/analytics');
+  const router = useRouter();
+  const { user, isLoading } = useAuth();
+  
+  useEffect(() => {
+    if (!isLoading) {
+      if (user) {
+        // 已登录用户重定向到分析页面
+        router.push('/analytics');
+      } else {
+        // 未登录用户重定向到登录页面
+        router.push('/login');
+      }
+    }
+  }, [user, isLoading, router]);
+  
+  // 显示加载指示器
+  return (
+    <div className="flex items-center justify-center min-h-screen">
+      <div className="text-center">
+        <div className="animate-spin rounded-full h-16 w-16 border-t-2 border-b-2 border-blue-500 mx-auto"></div>
+        <p className="mt-4 text-lg text-gray-700">正在加载...</p>
+      </div>
+    </div>
+  );
 }