fix: TransportStatsWidget 타입 오류 수정 (connectionId -> externalConnectionId)

frontend/components/dashboard/widgets/TransportStatsWidget.tsx

@@ -52,7 +52,7 @@ export default function TransportStatsWidget({ element, refreshInterval = 60000
         body: JSON.stringify({
           query: element.dataSource.query,
           connectionType: element.dataSource.connectionType || "current",
-          connectionId: element.dataSource.connectionId,
+          externalConnectionId: element.dataSource.externalConnectionId,
         }),
       });
 
@@ -150,6 +150,7 @@ export default function TransportStatsWidget({ element, refreshInterval = 60000
     loadData();
     const interval = setInterval(loadData, refreshInterval);
     return () => clearInterval(interval);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [refreshInterval, element?.dataSource]);
 
   if (isLoading && !stats) {