feat: add KnowledgeGraph component for D3-based visualization and AI-driven graph management

src/components/admin/KnowledgeGraph.jsx

@@ -1,6 +1,6 @@
 import React, { useCallback, useEffect, useRef, useState } from 'react';
 import * as d3 from 'd3';
-import { Trash2, Edit2, Save, X, RefreshCw, AlertCircle, Plus, Link as LinkIcon, Github } from 'lucide-react';
+import { Trash2, Edit2, Save, X, RefreshCw, AlertCircle, Plus, Link as LinkIcon } from 'lucide-react';
 import * as db from '../../lib/db';
 import { anthropicApi } from '../../lib/api';
 import { getRepoFolder } from '../../lib/giteaService';
@@ -343,7 +343,7 @@ Analyze this graph and return ONLY the optimized JSON object with this EXACT str
               variant="outline"
               className="w-full flex justify-center items-center gap-2"
             >
-              <Github size={16} className={isSyncing ? "animate-pulse" : ""} />
+              <RefreshCw size={16} className={isSyncing ? "animate-spin" : ""} />
               {isSyncing ? 'Checking for updates...' : 'Sync Employee Handbook'}
             </Button>
             {syncError && (