fix(timeline-time): fix custom dot

[liweijie0812]

🤔 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

💡 需求背景和解决方案

测试代码

import React, { useState } from 'react';
import { Timeline, Space, Radio } from 'tdesign-react';
import { TipsIcon, UserIcon, HeartIcon, HomeIcon } from 'tdesign-icons-react';

export default function LayoutTimeLine() {
  const [direction, setDirection] = useState<'left' | 'right' | 'alternate'>('left');
  const [mode, setMode] = useState<'same' | 'alternate'>('same');
  const [layout, setLayout] = useState<'vertical' | 'horizontal'>('vertical');

  return (
    <Space direction="vertical">
      <Space>
        <h4>时间轴方向</h4>
        <Radio.Group variant="default-filled" value={layout} onChange={(v) => setLayout(v as any)}>
          <Radio.Button value="vertical">垂直时间轴</Radio.Button>
          <Radio.Button value="horizontal">水平时间轴</Radio.Button>
        </Radio.Group>
      </Space>
      <Space>
        <h4>对齐方式</h4>
        <Radio.Group variant="default-filled" value={direction} onChange={(v) => setDirection(v as any)}>
          <Radio.Button value="left">左对齐</Radio.Button>
          <Radio.Button value="alternate">交错对齐</Radio.Button>
          <Radio.Button value="right">右对齐</Radio.Button>
        </Radio.Group>
      </Space>
      <Space>
        <h4>label对齐方式</h4>
        <Radio.Group variant="default-filled" value={mode} onChange={(v) => setMode(v as any)}>
          <Radio.Button value="same">同侧</Radio.Button>
          <Radio.Button value="alternate">交错</Radio.Button>
        </Radio.Group>
      </Space>
      <Timeline layout={layout} labelAlign={direction} mode={mode}>
        <Timeline.Item label="2022-01-01">事件一</Timeline.Item>
        <Timeline.Item label="2022-04-01" dot={<span>点</span>}>
          事件四
        </Timeline.Item>
        <Timeline.Item label="2022-02-01">事件二</Timeline.Item>
        <Timeline.Item label="2022-04-01" dot={<HomeIcon />}>
          事件四
        </Timeline.Item>
        <Timeline.Item label="2022-04-01" dot={<HomeIcon size="large" />}>
          事件四 large
        </Timeline.Item>
        <Timeline.Item label="2022-04-01" dot={<HomeIcon size="medium" />}>
          事件四 medium
        </Timeline.Item>
        <Timeline.Item label="2022-04-01" dot={<HomeIcon size="small" />}>
          事件四 medium
        </Timeline.Item>
        <Timeline.Item label="2022-03-01">事件三</Timeline.Item>
        <Timeline.Item label="2022-04-01">事件四</Timeline.Item>

        <Timeline.Item label="2022-04-01" dot={<HeartIcon />}>
          事件四
        </Timeline.Item>
        <Timeline.Item label="2022-02-01">事件二</Timeline.Item>
      </Timeline>
    </Space>
  );
}

样式我改不动先挂着了

📝 更新日志

• 本条 PR 不需要纳入 Changelog

tdesign-react

@tdesign-react/chat

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⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

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commit: 9dc191e