upgraded to next 15 and react 19.

app/api/auth/logout/route.ts

@@ -2,6 +2,7 @@ import { NextResponse } from 'next/server';
 import { cookies } from 'next/headers';
 
 export async function POST() {
-  cookies().delete('session_token');
+  const cookieStore = await cookies();
+  cookieStore.delete('session_token');
   return NextResponse.json({ success: true });
 }