UTM report.

src/app/(main)/reports/retention/RetentionReportPage.tsx

@@ -1,6 +1,11 @@
 'use client';
+import { Metadata } from 'next';
 import RetentionReport from './RetentionReport';
 
 export default function RetentionReportPage() {
   return <RetentionReport />;
 }
+
+export const metadata: Metadata = {
+  title: 'Retention Report',
+};