feat: collapse add item classname

[rayhomie]

No description provided.

[github-actions]

🎊 PR Preview 85093e6 has been successfully built and deployed to https://ant-design-ant-design-mini-preview-pr-1226.surge.sh

🕐 Build time: 298.019s

_{🤖 By surge-preview}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.47%. Comparing base (80d71da) to head (cde3c38).
Report is 50 commits behind head on master.

❗ Current head cde3c38 differs from pull request most recent head 85093e6

Please upload reports for the commit 85093e6 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1226      +/-   ##
==========================================
- Coverage   89.75%   89.47%   -0.28%     
==========================================
  Files         150      146       -4     
  Lines        3709     3563     -146     
  Branches      926      958      +32     
==========================================
- Hits         3329     3188     -141     
+ Misses        323      322       -1     
+ Partials       57       53       -4     

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