feat: Add vercel.json

src/pages/Route/LinekedStations.tsx

@@ -128,6 +128,10 @@ export const LinkedItemsContents = <
   const [isLoading, setIsLoading] = useState<boolean>(true);
   const [error, setError] = useState<string | null>(null);
 
+  useEffect(() => {
+    console.log(error);
+  }, [error]);
+
   const parentResource = "route";
   const childResource = "station";
 
@@ -219,7 +223,7 @@ export const LinkedItemsContents = <
 
       authInstance
         .post(`/${parentResource}/${parentId}/${childResource}`, requestData)
-        .then((response) => {
+        .then(() => {
           const newItem = allItems.find((item) => item.id === selectedItemId);
           if (newItem) {
             const updatedList = insertAtPosition(