Refactor carousel style

[07akioni]

[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
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

fix #25878

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Carousel children height smaller then parent node issue. Remove Carousel slide transparent border.
🇨🇳 Chinese	修复 Carousel 内子节点高度和容器相差几个像素的问题。移除 Carousel 内部节点的透明边框。

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• 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

[ant-design-bot]

[ant-design-bot]

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit e649951:

Sandbox	Source
antd reproduction template	Configuration

[codecov]

Codecov Report

Merging #25906 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #25906   +/-   ##
=======================================
  Coverage   99.57%   99.57%           
=======================================
  Files         373      373           
  Lines        7307     7307           
  Branches     2039     2032    -7     
=======================================
  Hits         7276     7276           
  Misses         31       31           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8800b56...e649951. Read the comment docs.