fix: remove dead store code and add search input maxLength

- Remove unused networkData, searchQuery, searchResults from zustand store
- Remove setNetworkData write in NetworkGraph
- Add maxLength={200} to search input

src/pages/ReferralNetwork/components/NetworkGraph.tsx

@@ -113,8 +113,6 @@ export function NetworkGraph({ data, className }: NetworkGraphProps) {
   const hoveredNodeId = useReferralNetworkStore((s) => s.hoveredNodeId);
   const highlightedNodes = useReferralNetworkStore((s) => s.highlightedNodes);
   const filters = useReferralNetworkStore((s) => s.filters);
-  const setNetworkData = useReferralNetworkStore((s) => s.setNetworkData);
-
   const killFA2 = useCallback(() => {
     if (fa2TimerRef.current !== null) {
       clearTimeout(fa2TimerRef.current);
@@ -140,8 +138,6 @@ export function NetworkGraph({ data, className }: NetworkGraphProps) {
     const graph = buildFullGraph(data);
     graphRef.current = graph;
 
-    setNetworkData(data);
-
     // Compute initial hidden set from current filters
     const initialFilters = useReferralNetworkStore.getState().filters;
     hiddenNodesRef.current = computeHiddenNodes(graph, initialFilters);
@@ -301,7 +297,7 @@ export function NetworkGraph({ data, className }: NetworkGraphProps) {
       setSigmaInstance(null);
       setGraphInstance(null);
     };
-  }, [data, setSelectedNode, setHoveredNode, setNetworkData, killFA2]);
+  }, [data, setSelectedNode, setHoveredNode, killFA2]);
 
   // Recompute hidden nodes when filters change, then refresh sigma
   // (no graph rebuild — positions and Sigma instance preserved)

src/pages/ReferralNetwork/components/NetworkSearch.tsx

@@ -117,6 +117,7 @@ export function NetworkSearch({ className }: NetworkSearchProps) {
           ref={inputRef}
           type="text"
           value={inputValue}
+          maxLength={200}
           onChange={(e) => setInputValue(e.target.value)}
           onFocus={() => {
             if (searchResults && debouncedQuery.length >= 2) setIsDropdownOpen(true);