fix(empty): correct css margin and docs

[Alex-huxiyang]

🤔 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

• 新特性

  • 更新了 Empty 组件的文档，增加了使用示例和属性说明，提升了文档的清晰度和可用性。
  • 新增了 actions 属性，支持自定义操作。
  • 增加了 CSS 变量以增强主题定制能力。

• 文档

  • 详细描述了 Empty 组件的使用方法、属性及其默认值。
  • 增强了多个示例展示，涵盖基本用法、尺寸变化和自定义内容。

• 样式

  • 调整了 Empty 组件中操作容器的边距，优化了组件的外观。

[coderabbitai]

Walkthrough

本次变更主要针对 Empty 组件的文档进行了更新，涉及多个语言版本的文档，包括英文、中文（简体和繁体）和 Taro 版本。更新内容包括新增和修改属性描述、示例、主题定制部分以及 CSS 变量的定义，旨在提供更全面的使用指导和自定义选项。此外，还对样式文件进行了调整，修改了某些边距属性，以改善组件的外观和布局。

Changes

文件路径	变更摘要
src/packages/empty/doc.en-US.md	更新了 Empty 组件文档，增加了多个示例和属性描述，包括 image, imageSize, title, description, size, status, actions。新增主题定制部分和 CSS 变量。
src/packages/empty/doc.md	在文档中新增 actions 属性，类型为 Array，默认值为 []；更新了主题定制部分，新增 CSS 变量 --nutui-empty-description-margin-top。
src/packages/empty/doc.taro.md	扩展了属性表，详细描述了每个属性；更新了主题定制部分，新增 CSS 变量 --nutui-empty-description-margin-top。
src/packages/empty/doc.zh-TW.md	增加了多个使用示例和属性描述，详细列出了属性及其类型和默认值，更新了主题定制部分。
src/packages/empty/empty.scss	修改了 .nut-empty 类中动作容器的边距，&-actions-base 的 margin-top 从 16px 增加到 24px，&-actions-small 的 margin-top 从 24px 减少到 16px。
src/styles/variables.scss	更新了多个颜色和样式变量，新增了多个 UI 组件的变量，移除了与空描述相关的变量。

Possibly related PRs

• feat(empty): add css variable nutui-empty-background-color #2451: 此 PR 为 Empty 组件添加了 CSS 变量，与主 PR 的文档增强相关。
• fix(empty): 修复 harmonycpp 部分未适配问题 #2676: 此 PR 解决了 Empty 组件的兼容性问题，与主 PR 的更新相符。
• feat(Empty): V14 #2760: 此 PR 对 Empty 组件进行了多项更新，包括 CSS 变量和文档，直接与主 PR 的文档增强相关。
• fix(card): harmony适配 #2800: 此 PR 更新了 Card 组件的版本，属于同一库，可能与 Empty 组件的文档和用法相关。

Suggested labels

size/XS, 2.x

Suggested reviewers

• oasis-cloud

兔子欢跃在草地，
文档更新真是美。
属性示例齐上阵，
自定义样式任君选。
让我们一起跳跃吧，
享受这份新变化！ 🐇✨

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between 116fbbf and b62dd44.

📒 Files selected for processing (6)

• src/packages/empty/doc.en-US.md (0 hunks)
• src/packages/empty/doc.md (0 hunks)
• src/packages/empty/doc.taro.md (0 hunks)
• src/packages/empty/doc.zh-TW.md (0 hunks)
• src/packages/empty/empty.scss (1 hunks)
• src/styles/variables.scss (0 hunks)

💤 Files with no reviewable changes (5)

• src/packages/empty/doc.md
• src/packages/empty/doc.zh-TW.md
• src/packages/empty/doc.en-US.md
• src/packages/empty/doc.taro.md
• src/styles/variables.scss

🔇 Additional comments (2)

src/packages/empty/empty.scss (2)

50-50: 基础尺寸动作区域间距调整合理！

增加到 24px 的上边距能为基础尺寸版本提供更好的视觉层次感和空间布局。

---

55-55: 小尺寸动作区域间距调整得当！

减小到 16px 的上边距与小尺寸版本的整体比例更加协调，维持了良好的视觉平衡。

---

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.98%. Comparing base (116fbbf) to head (b62dd44).
Report is 1 commits behind head on feat_v3.x.

Additional details and impacted files

@@            Coverage Diff             @@
##           feat_v3.x    #2819   +/-   ##
==========================================
  Coverage      83.98%   83.98%           
==========================================
  Files            220      220           
  Lines          17882    17882           
  Branches        2676     2676           
==========================================
  Hits           15019    15019           
  Misses          2858     2858           
  Partials           5        5           

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