fix(table): handle pagination className

[engvuchen]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

#6170

💡 需求背景和解决方案

1. table 文档未列出 pagination 传样式的最佳实践、pagination 定义也缺少 class;
2. table pagination 是个对象，试了 class、className，class 是正常合并样式，className 是覆盖了 pagination 的样式；
3. vue3 源码对 className，是直接设置到元素的 el.className；不会合并 class、className；

📝 更新日志

• 本条 PR 不需要纳入 Changelog

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commit: bafb65f

[Copilot]

Pull Request Overview

This PR fixes a bug in the Table component's pagination handling by adding support for the className prop. The issue was that when users tried to pass custom classes to the pagination component via the className property, it would override the default pagination styles instead of merging with them, as Vue 3 handles className differently from class.

Key Changes

• Added conversion logic to transform className to class for proper class merging in Vue 3
• Extended the type definition to accommodate both class and className properties

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