feat：add maxTagPlaceholder api

[rubbishmaker]

https://github.com/ant-design/ant-design/issues/54822 对应此需求

Summary by CodeRabbit

• 新功能

  • SinglePicker 新增 maxTagCount 与 maxTagPlaceholder 属性，支持自定义超出标签占位内容，默认显示 “+ N …”。

• 体验

  • 占位渲染改为可配置：当未超出时不显示占位；超出时可展示自定义或默认文本，传入被省略的项列表用于渲染。

• 文档

  • 更新 multiple 示例，演示 maxTagCount 与自定义 maxTagPlaceholder 用法及多选场景。

• 测试

  • 新增覆盖多场景的用例（未超限、超限、自定义占位、maxTagCount=0、验证 omittedValues）。

[vercel[bot]]

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Project	Deployment	Preview	Comments	Updated (UTC)
picker	Ready	Preview	Comment	Sep 5, 2025 7:23am

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