feat: add KnowledgeGraph visualization and handbook synchronization component for admin interface

src/components/admin/KnowledgeGraph.jsx

@@ -251,7 +251,7 @@ const KnowledgeGraph = () => {
             }
           }
         }
-        setSyncProgress('Sync Complete!');
+        setSyncProgress('Sync Complete! Click "Analyze & Optimize Graph" above to clean up and merge.');
         reloadKb();
       }
 
@@ -259,7 +259,7 @@ const KnowledgeGraph = () => {
       setSyncError(e.message || 'Failed to check GitHub for updates.');
     } finally {
       setIsSyncing(false);
-      setTimeout(() => setSyncProgress(null), 5000); // Clear progress after 5s
+      setTimeout(() => setSyncProgress(null), 10000); // Clear progress after 10s
     }
   };