type: improve tree component assert

[thinkasany]

中文版模板 / Chinese template

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update

🔗 Related issue link

💡 Background and solution

📝 Changelog

• Use a developer-oriented tone and narrative style.
• Describe the user's first-hand experience of the issue and its impact on developers, rather than your solution approach.
• Refer to: ant.design/changelog

Language	Changelog
🇺🇸 English	type: improve tree component assert
🇨🇳 Chinese	type: 优化tree组件类型断言

[stackblitz]

Run & review this pull request in StackBlitz Codeflow.

[github-actions]

[github-actions]

👁 Visual Regression Report for PR #49784 Passed ✅

🎯 Target branch: master (17ad651)
📖 View Full Report ↗︎

🎊 Congrats! No visual-regression diff found.

[pkg-pr-new]

commit: 3d65cbf

antd

npm i https://pkg.pr.new/ant-design/ant-design/antd@49784

---

templates

• default

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@            Coverage Diff            @@
##             master   #49784   +/-   ##
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  Coverage          ?   99.99%           
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  Files             ?      748           
  Lines             ?    13057           
  Branches          ?     3405           
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  Hits              ?    13056           
  Misses            ?        1           
  Partials          ?        0           

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