n-data-table的树状表格在表头有分组的时候出现样式错误

[jenifly]

Describe the bug

具体情况如上

Steps to reproduce

1.添加n-data-table的分组表头
2.设置含有children的datalist

Link to minimal reproduction

无

System Info

win11
edge 131.0.2903.86，
naive-ui 2.40.0

Used Package Manager

pnpm

Validations

• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.

[jenifly]

<template>
  <div>
    <n-data-table style="width: 400px" striped :single-line="false" :columns="c" :data="d"></n-data-table>
  </div>
</template>

<script setup lang="ts">
  const c: any = [
    {
      title: 'a',
      key: 'a',
    },
    {
      title: 'b',
      key: 'b',
      children: [
        { title: 'b1', key: 'b1' },
        { title: 'b2', key: 'b2' },
      ],
    },
  ]

  const d: any = [
    {
      a: 'a1',
      b1: 'b1',
      b2: 'b2',
      children: [
        {
          a: 'a2',
          b1: 'b2',
          b2: 'b2',
        },
        {
          a: 'a1',
          b1: 'b1',
          b2: 'b2',
        },
      ],
    },
  ]
</script>

[jahnli]

Provide a based on CodeSandbox or stackblitz `s Minimal Reproducible Example

[jenifly]

Provide a based on CodeSandbox or stackblitz `s Minimal Reproducible Example

https://codesandbox.io/p/devbox/jovial-pateu-j7swky