fix: merge后14个测试修复+前端TS编译修复 - 895/895通过+前端零错误

frontend/src/pages/DataDictionaryPage.tsx

@@ -1,7 +1,7 @@
 import { useState, useEffect, useCallback, useMemo } from 'react';
 import {
   BookOpen, Database, Table2, Search, Download, Columns3, Key, Code2, RefreshCw,
-  ChevronRight, ChevronDown, Hash, AlignLeft, Gauge, FolderOpen, ArrowRight,
+  ChevronRight, Hash, AlignLeft, Gauge, FolderOpen, ArrowRight,
   FileJson, TableProperties, Info,
 } from 'lucide-react';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
@@ -173,7 +173,6 @@ export default function DataDictionaryPage() {
   const [activeTab, setActiveTab] = useState<TabKey>('columns');
   const [loading, setLoading] = useState(false);
   const [expandedDbs, setExpandedDbs] = useState<Set<string>>(new Set());
-  const [dbTreeExpanded, setDbTreeExpanded] = useState(true);
 
   // Load instances
   useEffect(() => {