refactor(admin): 用已安装的 file-saver/fast-deep-equal 替代手写下载与 JSON 比较

apps/admin/src/components/AiChat/DynamicChart.tsx

@@ -1,4 +1,5 @@
 import React, { lazy, Suspense, useEffect, useMemo, useState } from 'react';
+import { saveAs } from 'file-saver';
 import { XCard, registerCatalog, type XAgentCommand_v0_9 } from '@ant-design/x-card';
 import { Button, Spin, Tag, Tooltip, Typography } from 'antd';
 import { DownloadOutlined } from '@ant-design/icons';
@@ -232,12 +233,7 @@ const ChartPreview: React.FC<ChartPreviewProps> = ({ chart }) => {
       pixelRatio: 2,
       backgroundColor: '#fff',
     });
-    const link = document.createElement('a');
-    link.href = url;
-    link.download = `${chart.title || '图表'}.png`;
-    document.body.appendChild(link);
-    link.click();
-    link.remove();
+    saveAs(url, `${chart.title || '图表'}.png`);
   };
 
   return (