fix: Button two Chinese chars

[MadCcc]

[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

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Button that two Chinese characters in nested span should have space between.
🇨🇳 Chinese	修复 Button 组件只有两个汉字且嵌套在多层 span 中时间距丢失的问题。

☑️ 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 4997816

This pull request enhances the button component to support two Chinese characters as its content. It adds a new demo file components/button/demo/chinese-chars-loading.tsx and updates the style file components/button/style/index.ts to adjust the spacing and letter spacing of the buttons.

🔍 Walkthrough

🤖 Generated by Copilot at 4997816

• Add a button with two Chinese characters to the demo file components/button/demo/chinese-chars-loading.tsx (link)
• Adjust the spacing and letter spacing of buttons with two Chinese characters in the style file components/button/style/index.ts (link)

[stackblitz]

Run & review this pull request in StackBlitz Codeflow.

[github-actions]

[github-actions]

size-limit report 📦

Path	Size
./dist/antd.min.js	394.35 KB (+63 B 🔺)
./dist/antd-with-locales.min.js	453.55 KB (+69 B 🔺)

[argos-ci]

The latest updates on your projects. Learn more about Argos notifications ↗︎

Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No change detected	-	Sep 27, 2023, 11:58 AM

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (051a038) 100.00% compared to head (4997816) 100.00%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #45126   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          681       681           
  Lines        11519     11519           
  Branches      3095      3095           
=========================================
  Hits         11519     11519           

Files	Coverage Δ
components/button/style/index.ts	100.00% <ø> (ø)

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