chore: snapshot before performance optimization

keep-notes/app/(main)/layout.tsx

@@ -9,8 +9,11 @@ export default async function MainLayout({
 }: Readonly<{
   children: React.ReactNode;
 }>) {
-  const session = await auth();
-  const initialLanguage = await detectUserLanguage();
+  // Run auth + language detection in parallel
+  const [session, initialLanguage] = await Promise.all([
+    auth(),
+    detectUserLanguage(),
+  ]);
 
   return (
     <ProvidersWrapper initialLanguage={initialLanguage}>