Optimize graph state management & performance for tab switching visibility

• Reset graph data without recreating instance
• Fix search result caching on graph updates

lightrag_webui/src/components/graph/GraphSearch.tsx

@@ -1,4 +1,4 @@
-import { FC, useCallback, useMemo } from 'react'
+import { FC, useCallback, useEffect, useMemo } from 'react'
 import {
   EdgeById,
   NodeById,
@@ -28,6 +28,7 @@ function OptionComponent(item: OptionItem) {
 }
 
 const messageId = '__message_item'
+// Reset this cache when graph changes to ensure fresh search results
 const lastGraph: any = {
   graph: null,
   searchEngine: null
@@ -48,6 +49,15 @@ export const GraphSearchInput = ({
   const { t } = useTranslation()
   const graph = useGraphStore.use.sigmaGraph()
 
+  // Force reset the cache when graph changes
+  useEffect(() => {
+    if (graph) {
+      // Reset cache to ensure fresh search results with new graph data
+      lastGraph.graph = null;
+      lastGraph.searchEngine = null;
+    }
+  }, [graph]);
+
   const searchEngine = useMemo(() => {
     if (lastGraph.graph == graph) {
       return lastGraph.searchEngine