feat(Dropdown): unified provision of custom prefixCls

[EmilyyyLiu]

统一添加自定义class 前缀
关联issue #6960

[github-actions]

[gemini-code-assist]

Summary of Changes

Hello @EmilyyyLiu, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在为 Dropdown 组件及其子组件 Dropdown.Item 提供统一且灵活的自定义类名前缀机制。通过集成 ConfigProvider 的 getPrefixCls 方法，组件现在能够响应全局配置的前缀，并允许开发者在单个组件实例上进行局部覆盖，从而增强了组件的可定制性和样式管理能力。

Highlights

• 统一前缀类名管理: Dropdown 和 Dropdown.Item 组件现在通过 ConfigProvider 统一管理 prefixCls，允许全局配置组件的类名前缀。
• 组件级前缀类名覆盖: Dropdown 组件新增 prefixCls 属性，支持在组件层面覆盖 ConfigProvider 提供的默认前缀，提供了更细粒度的控制。
• 内部类名动态化: 移除了组件内部硬编码的 classPrefix 常量，所有相关的类名都动态地使用 getPrefixCls 方法生成，增强了灵活性和可维护性。
• 测试用例增强: 增加了新的测试用例，验证了 ConfigProvider 和组件级 prefixCls 的正确应用，确保了功能的稳定性。

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[pkg-pr-new]

npm i https://pkg.pr.new/ant-design/ant-design-mobile/antd-mobile@6982

commit: de77c01

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.96%. Comparing base (bfde19d) to head (de77c01).

Additional details and impacted files

@@             Coverage Diff             @@
##           feature    #6982      +/-   ##
===========================================
+ Coverage    92.95%   92.96%   +0.01%     
===========================================
  Files          337      337              
  Lines         7368     7368              
  Branches      1871     1861      -10     
===========================================
+ Hits          6849     6850       +1     
+ Misses         483      482       -1     
  Partials        36       36              

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[gemini-code-assist]

Code Review

本次 PR 旨在为 Dropdown 组件统一提供自定义 prefixCls 的能力。整体实现思路是正确的，通过 useConfig 和 getPrefixCls 来动态生成类名。然而，我发现一个关于 prefixCls 继承的问题：当给 Dropdown 组件设置 prefixCls 属性时，其子组件 Dropdown.Item 没有继承这个前缀，而是使用了来自 ConfigProvider 的全局前缀。这会导致父子组件的 class 前缀不一致。我在测试文件中指出了这个问题，并提供了修复建议。修复这个问题将能确保组件在各种场景下样式的一致性和可预测性。