fix: resolve syntax error in App.tsx (handleTrafficFetch)

App.tsx

@@ -125,6 +125,14 @@ const App: React.FC = () => {
     }
   }, []);
 
+  const handleTrafficFetch = useCallback(async () => {
+    try {
+      console.log('[App] Fetching traffic from /api/fetch-traffic...');
+      const response = await fetch('/api/fetch-traffic');
+      if (!response.ok) throw new Error(`Failed to fetch traffic: ${response.status}`);
+
+      const buffer = await response.arrayBuffer();
+      const data = await processTrafficExcel(buffer);
       setTrafficData(data);
       console.log('[App] Successfully loaded', data.length, 'traffic records');
     } catch (error) {