feat(dialog): 添加变量处理

[xiaoyatong]

🤔 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

• 新功能
  • 为对话框组件的取消按钮新增了背景色定制选项，用户现在可以通过设置自定义变量灵活调整按钮背景色，从而提升整体视觉体验。
• 文档
  • 更新了对话框组件的相关说明，新增了用于控制取消按钮背景色的变量信息，并标明了默认值，方便用户进行个性化定制。

[coderabbitai]

Walkthrough

此次 PR 对对话框组件的样式进行了调整，主要为取消按钮新增了背景设置。通过在 SCSS 文件中引入变量 $dialog-footer-cancel-bg，并在文档中同步添加了对应的 CSS 变量 --nutui-dialog-footer-cancel-bg，使取消按钮的背景颜色可以定制化。与此同时，在相关变量配置文件中也同步更新了定义和默认值。

Changes

文件	变更说明
src/packages/dialog/dialog.scss	为 .nut-dialog-footer-cancel 类新增了 background: $dialog-footer-cancel-bg; 属性。
src/packages/dialog/doc*.md	在各文档中新增 CSS 变量 --nutui-dialog-footer-cancel-bg（部分文件为转义形式），默认值为 transparent，用于定制取消按钮背景。
src/styles/variables*.scss	新增 SCSS 变量 $dialog-footer-cancel-bg，分别在不同文件中定义，提供对应的默认回退值。

Possibly related PRs

• feat: 修订 jm 变量名 #3127: 与取消按钮样式变量的添加相关，涉及相似的背景样式调整。
• feat(Dialog): harmony adaptation #2790: 涉及 dialog 取消按钮背景样式的变量添加，代码层面有较高关联性。

Suggested reviewers

• oasis-cloud

Poem

我是一只快乐的小兔，
跳跃在代码的绿野间。
新增的背景色如春夜星光，
为取消按钮披上了亮丽的彩衣。
🐰代码美梦，与你同行！

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.20%. Comparing base (79a9900) to head (6d8c6ef).
Report is 1 commits behind head on feat_v3.x.

Additional details and impacted files

@@            Coverage Diff             @@
##           feat_v3.x    #3172   +/-   ##
==========================================
  Coverage      87.20%   87.20%           
==========================================
  Files            279      279           
  Lines          18540    18540           
  Branches        2822     2822           
==========================================
  Hits           16167    16167           
  Misses          2368     2368           
  Partials           5        5           

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

Actionable comments posted: 0

🧹 Nitpick comments (1)

src/packages/dialog/dialog.scss (1)

130-133: 新增取消按钮背景变量的使用

在.nut-dialog-footer-cancel样式中增加了 background: $dialog-footer-cancel-bg;，使取消按钮的背景色可以通过 SCSS 变量进行定制化。请确认这项改动与文档中对 CSS 变量 --nutui-dialog-footer-cancel-bg 的描述保持一致，并验证不同主题下的显示效果。

📜 Review details

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

📥 Commits

Reviewing files that changed from the base of the PR and between 79a9900 and 6d8c6ef.

📒 Files selected for processing (7)

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

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: test

🔇 Additional comments (6)

src/packages/dialog/doc.en-US.md (1)

162-162: 新增 CSS 变量描述无误
这一行成功新增了 CSS 变量 --nutui-dialog-footer-cancel-bg，并明确标明默认值为 transparent。请确保描述与其他文档中保持一致。

src/packages/dialog/doc.md (1)

162-162: 新增 CSS 变量记录正确
该行文档中准确地介绍了新增加的变量 --nutui-dialog-footer-cancel-bg，并说明其默认值为 transparent，符合预期。建议检查其它描述部分与设计文档的一致性。

src/styles/variables-jmapp.scss (1)

1467-1467: SCSS 变量定义正确
在此处新增的 $dialog-footer-cancel-bg 变量通过 var(--nutui-dialog-footer-cancel-bg, transparent) 正确地引用了对应的 CSS 变量，并提供了合适的默认值。建议保持与其它变量定义的一致命名和格式。

src/packages/dialog/doc.taro.md (1)

142-142: Taro 文档中新增 CSS 变量显示正确
这行代码准确反映了新变量 --nutui-dialog-footer-cancel-bg 的用途和默认值 transparent，确保了在 Taro 平台下文档的一致性。

src/packages/dialog/doc.zh-TW.md (1)

162-162: 繁體中文文檔中新增變量描述正確
此處正確地記錄了 CSS 變量 --nutui-dialog-footer-cancel-bg，並指出預設值為 transparent。請確認此描述與其他語言版本保持一致。

src/styles/variables.scss (1)

1358-1365: 新增并配置取消按钮背景变量

这里新增了变量 $dialog-footer-cancel-margin-right 以及 $dialog-footer-cancel-bg。

• $dialog-footer-cancel-margin-right 使用 CSS 变量 --nutui-dialog-footer-cancel-margin-right 默认值为 12px。
• $dialog-footer-cancel-bg 通过 CSS 变量 --nutui-dialog-footer-cancel-bg 获取背景色，默认回退为 $button-default-background-color（而 $button-default-background-color 默认定义为 transparent）。

建议检查文档说明，确保默认值与预期一致，并且在所有相关文档（如 doc.en-US.md、doc.zh-TW.md 等）中同步更新该 CSS 变量的描述。