fix(Dropdown): Focus outline being blocked by other elements

[Yuiai01]

[中文版模板 / Chinese template]

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• New feature
• Bug fix
• Site / documentation update
• Demo update
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• TypeScript definition update
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🔗 Related issue link

close #41175

💡 Background and solution

当前在 Space.Compact 内的按钮，使用 Tab 聚焦的话，聚焦轮廓会被其他元素遮挡 。下图为修改前后对比。
修改前：

修改后：

📝 Changelog

Language	Changelog
🇺🇸 English	Fixed dropdown button focus outline being blocked by other elements
🇨🇳 Chinese	修复下拉按钮的聚焦轮廓被其他元素遮挡

☑️ 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

[github-actions]

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (39adae8) 100.00% compared to head (15e19aa) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #41282   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          610       610           
  Lines        10494     10450   -44     
  Branches      2868      2847   -21     
=========================================
- Hits         10494     10450   -44     

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

... and 4 files with indirect coverage changes

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