fix(funnel): 修复漏斗图图例操作后显示错误

[taoeer]

PR includes

• fixed 🐛 [BUG] 漏斗图点击图例后展示错误 #3873
• add / modify test cases
• documents, demos

Screenshot

Before	After
❌	✅

[gemini-code-assist]

Summary of Changes

Hello @taoeer, 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!

此拉取请求旨在解决漏斗图在用户进行图例操作后出现的显示错误。核心改动在于优化了数据转换逻辑，通过采用不可变数据操作的方式，确保每次数据处理都生成新的数据副本，从而避免了因数据意外修改而导致的渲染问题，提升了图表的稳定性和交互体验。

Highlights

• 修复漏斗图显示错误: 此PR修复了漏斗图在图例操作后可能出现的显示错误。
• 数据转换逻辑优化: 通过修改 transformData 函数，确保数据转换时返回新的数据对象，而非直接修改原始数据行，从而避免了潜在的副作用和数据突变问题。

Changelog

• src/plots/funnel/geometries/common.ts
  • 修改了 transformData 函数，使其在处理数据时返回一个新的数据对象，而不是直接修改传入的 row 对象，以实现数据不可变性。

Activity

• 拉取请求由 taoeer 创建。
• 此更改旨在修复 🐛 [BUG] 漏斗图点击图例后展示错误 #3873 中描述的问题。
• PR 描述中包含前后对比截图，清晰展示了问题已得到解决。
• PR 描述中未明确指出增加了或修改了测试用例或文档。

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[gemini-code-assist]

Code Review

本次 PR 通过在 transformData 函数中采用不可变（immutable）的方式处理数据，修复了漏斗图在图例交互后可能出现的显示错误，这是一个很好的改进。我添加了一条评论，建议增加相应的测试用例来防止未来的回归。除此之外，代码修改看起来很棒。

[gemini-code-assist]

这个修改很棒，通过返回新对象而不是修改原始对象，避免了副作用。为了保证这个修复的长期有效性并防止回归，建议增加一个单元测试来验证 transformData 的调用不会修改传入的 data 数组中的对象。例如，可以在测试中保留一份原始数据的副本，并在调用 render 后断言原始数据未被更改。