fix(pro:search): searchItem mousedown doesn't trigger focused

[sallerli1]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

点击搜索项没有触发focus
overlayContainer的dom查找不正确

What is the new behavior?

修复以上问题

Other information

display:none导致元素内的focus事件不能正常触发，隐藏样式修改为使用 height:0;width:0;opacity:0 实现
加入了overlayContainerFallback之后没有调整overlay容器Dom获取计算

[idux-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #1368 (667a8a1) into main (f90d791) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1368      +/-   ##
==========================================
- Coverage   92.92%   92.89%   -0.04%     
==========================================
  Files         324      324              
  Lines       29827    29838      +11     
  Branches     2474     2474              
==========================================
  Hits        27718    27718              
- Misses       2109     2120      +11     

Impacted Files	Coverage Δ
packages/pro/search/src/ProSearch.tsx	15.63% <0.00%> (-0.87%)	⬇️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.