feat: Tooltip support z-index manager

[kiner-tang]

[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
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Workflow
• Other (about what?)

🔗 Related issue link

• 📝[RFC] Support zIndexContext to manage popup's zIndex in Pop-up container #45154

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Tooltip Support z-index context to manage z-index
🇨🇳 Chinese	工具提示支持 z-index 上下文管理 z-index

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

---

🚀 Summary

🤖 Generated by Copilot at 1e6c15f

Added a new feature to Tooltip component to support nested tooltips and custom z-index values. Implemented a custom hook useZIndex and a context ZIndexContext to manage the z-index values of tooltips and other components. Updated the test file tooltip.test.tsx to cover the new feature.

🔍 Walkthrough

🤖 Generated by Copilot at 1e6c15f

• Enable nested z-index values and respect zIndex prop for Tooltip component (link, link, link)
  • Import useZIndex hook and zIndexContext from ../_util (link, link)
  • Wrap Tooltip with zIndexContext.Provider and pass contextZIndex value to child components (link)
  • Pass zIndex value from hook to RcTooltip prop (link)
• Add test case for nested Tooltip and Select components with different popupClassName and rootClassName props (link)
  • Import Select component from antd (link)
  • Render three levels of Tooltip and Select components and expect z-index values to be accumulated (link)

[stackblitz]

Run & review this pull request in StackBlitz Codeflow.

[github-actions]

[github-actions]

size-limit report 📦

Path	Size
./dist/antd.min.js	399.32 KB (+25 B 🔺)
./dist/antd-with-locales.min.js	458.63 KB (+26 B 🔺)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (refactor-z-index-context@bff04cd). Click here to learn what that means.

Additional details and impacted files

@@                     Coverage Diff                      @@
##             refactor-z-index-context    #45422   +/-   ##
============================================================
  Coverage                            ?   100.00%           
============================================================
  Files                               ?       697           
  Lines                               ?     11736           
  Branches                            ?      3138           
============================================================
  Hits                                ?     11736           
  Misses                              ?         0           
  Partials                            ?         0           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.