docs: Add motion & dropdown faq

[zombieJ]

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

🔗 Related issue link

#41856 (comment)

close #43025

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	-
🇨🇳 Chinese	-

☑️ 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

---

🚀 Summary

🤖 Generated by Copilot at 9bb9769

This pull request improves the documentation and the code example of the Customize Theme feature and the Dropdown component. It adds new sections on how to disable motion and how to prevent horizontal squeezing of the Dropdown, and fixes some formatting issues. It also creates a new Markdown and TypeScript file for the motion code example.

🔍 Walkthrough

🤖 Generated by Copilot at 9bb9769

• Add a new FAQ section to the documentation of the Dropdown component, explaining how to prevent the Dropdown from being squeezed when it exceeds the screen horizontally (link, link)
• Add a new subsection to the documentation of the Customize Theme feature, showing how to use the motion token to control the animation effect of the components (link, link)
• Fix the formatting of the code examples in the documentation of the Customize Theme feature, by removing the unnecessary parentheses around the JSX expressions (link, link)
• Add a new code example for the motion feature, with a Markdown file motion.md and a TypeScript file motion.tsx (link, link)

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[github-actions]

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size-limit report 📦

Path	Size
./dist/antd.min.js	377.31 KB
./dist/antd-with-locales.min.js	436.77 KB

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (78923c5) 100.00% compared to head (5fccefb) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #43403   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          648       648           
  Lines        10967     10994   +27     
  Branches      2978      2989   +11     
=========================================
+ Hits         10967     10994   +27     

see 3 files with indirect coverage changes

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