feat: add transition to spin fullscreen

[li-jia-nan]

[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	feat: add transition to spin fullscreen
🇨🇳 Chinese	给全屏状态的 spin 蒙层添加过渡

☑️ 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 1e307a5

Improved the spin component's style, demo, and logic for fullscreen mode. Fixed a TypeScript error and added transition effects for the fullscreen spinner.

🔍 Walkthrough

🤖 Generated by Copilot at 1e307a5

• Refactor demo code for fullscreen spin component to use clearer state variable, longer duration, and spinning prop (link)
• Rename spin component style file from index.tsx to index.ts and remove empty export statement (link)
• Add new CSS class name and rule for fullscreen spinner to control visibility and opacity based on fullscreen and spinning props (link, link)

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[github-actions]

[github-actions]

size-limit report 📦

Path	Size
./dist/antd.min.js	398.91 KB (+25 B 🔺)
./dist/antd-with-locales.min.js	458.22 KB (+28 B 🔺)

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Build	Status	Details	Updated (UTC)
default (Inspect)	👍 Changes approved	1 change	Oct 19, 2023, 5:29 PM

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (cc223a1) 100.00% compared to head (1e307a5) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##           feature    #45436   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          695       696    +1     
  Lines        11712     11721    +9     
  Branches      3131      3132    +1     
=========================================
+ Hits         11712     11721    +9     

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

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