fix: build error 수정

- useSearchParams 를 사용하는 곳에서는 Suspense 를 사용해야해서 수정

Author: KIMSEUNGGYU

frontend/zicdding-class.com/app/class/page.tsx

@@ -1,7 +1,12 @@
 'use client';
 
 import { ClassListPage } from '@/src/views/class-list';
+import { Suspense } from 'react';
 
 export default function Page() {
-  return <ClassListPage />;
+  return (
+    <Suspense fallback={<div>Loading...</div>}>
+      <ClassListPage />
+    </Suspense>
+  );
 }