fix(ui): 转换 Big 对象为原生数字修复服务端序列化报错，并补充 Fragment key 修复列表渲染警告

app/dashboard/page.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useState, useEffect, useTransition } from 'react';
+import React, { useState, useEffect, useTransition } from 'react';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
 import {
   Table,
@@ -214,8 +214,8 @@ export default function DashboardPage() {
                   const isExpanded = !!expandedIds[pos.assetId];
 
                   return (
-                    <>
-                      <TableRow key={pos.assetId} className="cursor-pointer" onClick={() => toggleExpand(pos.assetId)}>
+                    <React.Fragment key={pos.assetId}>
+                      <TableRow className="cursor-pointer" onClick={() => toggleExpand(pos.assetId)}>
                         <TableCell>
                           <div className="flex flex-col">
                             <span className="font-semibold">{pos.name || pos.symbol}</span>
@@ -361,7 +361,7 @@ export default function DashboardPage() {
                           </TableCell>
                         </TableRow>
                       )}
-                    </>
+                    </React.Fragment>
                   );
                 })}
               </TableBody>