fix: hide arrow for last item in vertical navigation Steps

[ohhoney1]

[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
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🔗 Related issue link

fix #44536

💡 Background and solution

The last item in the vertical navigation Steps component should hide the arrow.

📝 Changelog

Language	Changelog
🇺🇸 English	fix the issue that the last arrow of the vertical navigation Steps is not hidden
🇨🇳 Chinese	修复垂直导航步骤条的最后一项箭头没隐藏的问题

☑️ 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

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🚀 Summary

🤖 Generated by Copilot at ffcb8e6

Fix a visual bug in the steps component by hiding the unnecessary line after the last step. Modify the CSS file components/steps/style/nav.ts to achieve this.

🔍 Walkthrough

🤖 Generated by Copilot at ffcb8e6

• Hide the line after the last step in horizontal and vertical navigation (link, in components/steps/style/nav.ts)

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Build	Status	Details	Updated (UTC)
default (Inspect)	👍 Changes approved	1 change	Sep 1, 2023, 2:37 PM

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e689878) 100.00% compared to head (ffcb8e6) 100.00%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #44582   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          665       665           
  Lines        11280     11280           
  Branches      3049      3049           
=========================================
  Hits         11280     11280           

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

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