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/components/ProtectedRoute.tsx

@@ -0,0 +1,42 @@
+'use client';
+
+import { useEffect } from 'react';
+import { useRouter } from 'next/navigation';
+import { useAuth } from '@/lib/auth';
+
+export default function ProtectedRoute({ children }: { children: React.ReactNode }) {
+  const router = useRouter();
+  const { user, isLoading } = useAuth();
+  
+  useEffect(() => {
+    // 如果非加载状态且用户未登录，重定向到登录页
+    if (!isLoading && !user) {
+      console.log('ProtectedRoute: 未登录，重定向到登录页');
+      // 保存当前URL以便登录后可以返回
+      const currentUrl = window.location.href;
+      router.push(`/login?redirect=${encodeURIComponent(currentUrl)}`);
+    }
+  }, [isLoading, user, router]);
+  
+  // 如果正在加载，显示加载指示器
+  if (isLoading) {
+    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 dark:text-gray-300">加载中...</p>
+        </div>
+      </div>
+    );
+  }
+  
+  // 如果用户未登录，不渲染任何内容（等待重定向）
+  if (!user) {
+    console.log('ProtectedRoute: 用户未登录，等待重定向');
+    return null;
+  }
+  
+  // 用户已登录，渲染子组件
+  console.log('ProtectedRoute: 用户已登录，渲染内容');
+  return <>{children}</>;
+}