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);

src/store/referralNetwork.ts

@@ -1,11 +1,5 @@
 import { create } from 'zustand';
-import type {
-  NetworkGraphData,
-  SelectedNode,
-  NetworkFilters,
-  NetworkUserNode,
-  NetworkCampaignNode,
-} from '@/types/referralNetwork';
+import type { SelectedNode, NetworkFilters } from '@/types/referralNetwork';
 
 const DEFAULT_FILTERS: NetworkFilters = {
   campaigns: [],
@@ -14,51 +8,33 @@ const DEFAULT_FILTERS: NetworkFilters = {
 };
 
 interface ReferralNetworkState {
-  networkData: NetworkGraphData | null;
   selectedNode: SelectedNode;
   hoveredNodeId: string | null;
   highlightedNodes: Set<string>;
-  searchQuery: string;
-  searchResults: { users: NetworkUserNode[]; campaigns: NetworkCampaignNode[] };
   filters: NetworkFilters;
   isFiltersOpen: boolean;
 
-  setNetworkData: (data: NetworkGraphData) => void;
   setSelectedNode: (node: SelectedNode) => void;
   setHoveredNode: (id: string | null) => void;
   setHighlightedNodes: (nodes: Set<string>) => void;
-  setSearchQuery: (query: string) => void;
-  setSearchResults: (results: {
-    users: NetworkUserNode[];
-    campaigns: NetworkCampaignNode[];
-  }) => void;
   updateFilters: (filters: Partial<NetworkFilters>) => void;
   resetFilters: () => void;
   setIsFiltersOpen: (open: boolean) => void;
 }
 
 export const useReferralNetworkStore = create<ReferralNetworkState>()((set) => ({
-  networkData: null,
   selectedNode: null,
   hoveredNodeId: null,
   highlightedNodes: new Set<string>(),
-  searchQuery: '',
-  searchResults: { users: [], campaigns: [] },
   filters: { ...DEFAULT_FILTERS },
   isFiltersOpen: false,
 
-  setNetworkData: (data) => set({ networkData: data }),
-
   setSelectedNode: (node) => set({ selectedNode: node }),
 
   setHoveredNode: (id) => set({ hoveredNodeId: id }),
 
   setHighlightedNodes: (nodes) => set({ highlightedNodes: nodes }),
 
-  setSearchQuery: (query) => set({ searchQuery: query }),
-
-  setSearchResults: (results) => set({ searchResults: results }),
-
   updateFilters: (partial) =>
     set((state) => ({
       filters: { ...state.filters, ...partial },