♻️ refactor(WordPreview): 清理未使用的Download图标导入

- 移除lucide-react中未使用的Download图标导入，减少不必要的依赖

src/client/home/pages/WordPreview.tsx

@@ -13,7 +13,7 @@ import {
   FileText, Upload, Download, Eye, FileWarning, FileSpreadsheet,
   RefreshCw, CheckCircle, AlertCircle, DownloadCloud, Image, Package,
   X, ZoomIn, ZoomOut, ChevronLeft, ChevronRight, Settings,
-  CheckSquare, Square, Download, Archive, CheckCheck
+  CheckSquare, Square, Archive, CheckCheck
 } from 'lucide-react';
 import { toast } from 'sonner';
 import WordViewer from '@/client/home/components/WordViewer';