fix: doc css

[xiaoyatong]

找设计帮忙改了改~

🤔 这个变动的性质是？

• 新特性提交
• 日常 bug 修复
• 站点、文档改进
• 演示代码改进
• 组件样式/交互改进
• TypeScript 定义更新
• 包体积优化
• 性能优化
• 功能增强
• 国际化改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他改动（是关于什么的改动？）

🔗 相关 Issue

💡 需求背景和解决方案

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• fork仓库代码是否为最新避免文件冲突
• Files changed 没有 package.json lock 等无关文件

Summary by CodeRabbit

• Style
  • 调整了导航菜单中列表项的间距，将行高由36px增至40px，使文本显示更加清晰易读。
  • 修改了文字粗细，采用更轻的字体风格，营造出现代感和舒适的视觉体验。

[coderabbitai]

Walkthrough

该变更仅更新了 nav.scss 样式文件中的 li 元素样式，将嵌套无序列表的行高从 36px 调整至 40px，并将字体粗细从 500 降低到 400，从而改变导航项的视觉展现，而不影响其功能。

Changes

文件	更改摘要
src/.../nav.scss	更新 li 元素样式：行高从 36px 改为 40px，字体粗细从 500 改为 400。

Possibly related PRs

• jdf2e/nutui-react#3105: 调整列表项行高和字体粗细，与本次变更存在相似之处。

Suggested reviewers

• Alex-huxiyang
• oasis-cloud

Poem

代码小径风拂面，
li 行新变意更鲜。
行高延展似春晖，
字体轻盈展新篇。
我这小兔轻跳来，
欢庆变更进万年！ 🐰

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.96%. Comparing base (41b3a0d) to head (bb4e7eb).
Report is 3 commits behind head on feat_v3.x.

Additional details and impacted files

@@            Coverage Diff             @@
##           feat_v3.x    #3126   +/-   ##
==========================================
  Coverage      86.96%   86.96%           
==========================================
  Files            280      280           
  Lines          18459    18459           
  Branches        2785     2785           
==========================================
  Hits           16052    16052           
  Misses          2402     2402           
  Partials           5        5           

☔ View full report in Codecov by Sentry.
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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

src/sites/sites-react/doc/components/nav/nav.scss (1)

64-69: 注意：检查高度属性的冲突

在 > ul li 的样式中，同时声明了 height: 36px;（行号65）和 height: 100%;（行号68）。在 CSS 中，后一条声明会覆盖前一条，请确认这是否为预期效果，或考虑移除冗余的高度设置以避免后续维护时产生混淆。

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 41b3a0d and bb4e7eb.

📒 Files selected for processing (1)

• src/sites/sites-react/doc/components/nav/nav.scss (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (2)

• GitHub Check: build
• GitHub Check: test

🔇 Additional comments (2)

src/sites/sites-react/doc/components/nav/nav.scss (2)

66-66: 更新行高为40px

根据设计要求，将嵌套列表项的 line-height 从原来的数值调整为 40px，以提高文本的可读性和整体视觉效果。

---

69-69: 修改字体粗细为400

将嵌套列表项的 font-weight 从较重的值调整为 400，使文字显示得更轻盈，与最新的设计风格保持一致。