fix: make the animation of Menu smoother while expanding the Sider wh…

[metouch]

[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
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🔗 Related issue link

#48121

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	make the animation of Menu smoother while expanding the Sider which embedded with a Menu
🇨🇳 Chinese	内嵌Menu的Sider在展开时，让Menu动画效果更加流畅

☑️ 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

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👁 Visual Regression Report for PR #48127 Passed ✅

🎯 Target branch: master (0a7e225)
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🎊 Congrats! No visual-regression diff found.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (0a7e225) to head (364dfa8).

❗ Current head 364dfa8 differs from pull request most recent head 052d1da. Consider uploading reports for the commit 052d1da to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            master    #48127    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          744       736     -8     
  Lines        12880     12684   -196     
  Branches      3367      3326    -41     
==========================================
- Hits         12880     12684   -196     

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