fix: style not applied to overflowed Menu

[dhalenok]

[中文版模板 / Chinese template]

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🔗 Related issue link

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💡 Background and solution

I've noticed that links in overflow menu were not working, if you were not clicking on the exact text in the link. This is due to prefixCls not being applied to the overflow menu.

📝 Changelog

Language	Changelog
🇺🇸 English	Fix style not applied to overflowed Menu
🇨🇳 Chinese	修復樣式不適用於溢出的菜單

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🚀 Summary

🤖 Generated by Copilot at 5aa9d4f

Fixed a theme bug for the overflowed menu items in Menu component. Used classNames to handle the overflowedIndicatorPopupClassName prop of rc-menu.

🔍 Walkthrough

🤖 Generated by Copilot at 5aa9d4f

• Fix popup menu theme bug for overflowed menu items by using classNames instead of string concatenation for overflowedIndicatorPopupClassName prop of rc-menu component (link in components/menu/menu.tsx)

[github-actions]

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e036396) 100.00% compared to head (5aa9d4f) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #42294   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          619       619           
  Lines        10547     10548    +1     
  Branches      2881      2881           
=========================================
+ Hits         10547     10548    +1     

Impacted Files	Coverage Δ
components/menu/menu.tsx	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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