docs: 修复 VuePress 默认 ul 样式导致的 Timeline demo 中 ul 样式变化

[CatSouta]

Summary by CodeRabbit

• Style
  • Improved timeline styling in documentation pages.

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[coderabbitai]

📝 Walkthrough

Walkthrough

A CSS rule is added to the docs theme styling file to remove default list styling and margins from unordered lists with the el-timeline class, affecting timeline element rendering within the documentation scope.

Changes

Cohort / File(s)	Summary
Documentation theme styling apps/docs/.vitepress/theme/var.css	Adds CSS rules for .vp-doc ul.el-timeline to remove list-style and reset margins

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested reviewers

• IsDyh01

Poem

🐰 ✨ A timeline needs no bullets, no space between,
Just clean lines flowing, the prettiest I've seen!
A rule in CSS, so simple and so sweet,
Makes the docs look gorgeous from head to feet! 📋

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: fixing VuePress default ul styles that caused Timeline demo styling issues.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[Copilot]

Pull request overview

This PR fixes a styling issue in the Timeline component demo where VuePress's default ul styles were interfering with the component's intended appearance. The fix applies targeted CSS overrides to ensure the Timeline component displays correctly in the documentation.

Changes:

• Added CSS rules to remove default list styling and margins for el-timeline elements within VitePress documentation

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