fix(notification): placement bottom animation should be correct

[linxianxi]

[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

fix #44919

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix the bug of pop-up animation at the bottom of notification
🇨🇳 Chinese	修复 notification 底部弹出动画的问题

☑️ 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 572dd72

This pull request enhances the notification component by using transform for smoother animation and fixing a minor style issue in placement.ts.

🔍 Walkthrough

🤖 Generated by Copilot at 572dd72

• Improve performance and fix bug of notification component when placed at the bottom of the screen by using transform instead of margin for animation (link)
• Format components/notification/style/placement.ts by adding an empty line at the beginning of the file (link)

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[github-actions]

[MadCcc]

看下 feature 上怎么写的吧，感觉会有冲突

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No change detected	-	Sep 18, 2023, 2:32 AM

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (102c465) 100.00% compared to head (57a077d) 100.00%.
Report is 17 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #44918   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          682       682           
  Lines        11540     11540           
  Branches      3105      3105           
=========================================
  Hits         11540     11540           

Files Changed	Coverage Δ
components/notification/style/placement.ts	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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