debug: add detailed logging to login response handling

frontend/app/login/page.tsx

@@ -56,8 +56,15 @@ export default function LoginPage() {
         password
       });
 
+      console.log('[LoginPage] Login response received:', {
+        access_token: tokenResponse.access_token?.substring(0, 20),
+        user_id: tokenResponse.user_id,
+        username: tokenResponse.username
+      });
+
       // Save JWT token and user info
       saveToken(tokenResponse);
+      console.log('[LoginPage] saveToken called. Checking localStorage:', localStorage.getItem('inventory_token')?.substring(0, 20));
       toast.success(`Welcome back, ${tokenResponse.username}`);
 
       // Delay slightly to show toast then redirect