Remove redundant sigma instance setup code in GraphViewer component

• Remove unused useLayoutEffect hook

lightrag_webui/src/components/graph/GraphControl.tsx

@@ -75,7 +75,7 @@ const GraphControl = ({ disableHoverEffect }: { disableHoverEffect?: boolean })
       // Double-check that the store has the sigma instance
       const currentInstance = useGraphStore.getState().sigmaInstance;
       if (!currentInstance) {
-        console.log('Setting sigma instance from GraphControl (backup)');
+        console.log('Setting sigma instance from GraphControl');
         useGraphStore.getState().setSigmaInstance(sigma);
       }
     }