fix(Table): 给个默认背景色，解决在飞书小程序中固定列与滚动内列混合

[kid-kang]

🤔 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

#2763

💡 需求背景和解决方案

在飞书小程序中使用Table固定列属性，固定列与滚动内列会混合，样式穿透

☑️ 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
  • 为粘性表头单元格添加默认背景颜色，以改善视觉效果。
• 样式
  • 更新了固定列的粘性表头背景颜色，确保在特定环境下的可读性。

[coderabbitai]

Walkthrough

此次更改主要涉及 table.scss 文件，新增了 .nut-table 类中粘性表头单元格的默认背景颜色。具体来说，为具有 .nut-table-fixed-left 或 .nut-table-fixed-right 类的 .nut-table-main-head-th 类引入了新的背景颜色属性。此更改旨在解决特定环境（称为“小程序”）中固定列与可滚动内列重叠的视觉问题。新的背景颜色设置为白色（#fff）。

Changes

文件路径	更改摘要
src/packages/table/table.scss	为 .nut-table-main-head-th 类添加了新的背景颜色属性，仅在其具有 .nut-table-fixed-left 或 .nut-table-fixed-right 类时生效。

Possibly related PRs

• feat(table): table新增自定义行 #2390: 此PR为表格组件引入了自定义行的新特性，与主PR中增强表头视觉一致性的样式更改相关。
• refactor: table #2473: 此PR重构了表格组件，包括可能与主PR中粘性表头样式调整相互影响的渲染逻辑更改。
• fix(tag): modify svg color #2761: 此PR修改了标签组件中的SVG颜色，虽然与表格样式没有直接关系，但表明UI组件的持续调整可能会影响整体视觉一致性。

Suggested labels

3.x

Suggested reviewers

• oasis-cloud

Poem

🐰 在表格中，头顶白色光，
粘性表头，视觉更强。
小程序里，重叠不见，
设计美好，兔子欢颜！ 🌟

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.04%. Comparing base (d107304) to head (4d88a1f).

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #2787      +/-   ##
==========================================
- Coverage   84.07%   84.04%   -0.04%     
==========================================
  Files         217      217              
  Lines       17830    17830              
  Branches     2609     2606       -3     
==========================================
- Hits        14991    14985       -6     
- Misses       2834     2840       +6     
  Partials        5        5              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

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[coderabbitai]

Actionable comments posted: 0

🧹 Outside diff range and nitpick comments (1)

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

77-78: 建议使用 CSS 变量替代硬编码的颜色值

这个修复解决了飞书小程序中固定列与滚动列混合的问题，代码逻辑正确。不过建议将背景色值改为使用 CSS 变量，以便于主题定制和维护。

建议按照以下方式修改：

- background-color: #fff;
+ background-color: var(--nut-table-fixed-bg-color, #fff);

这样做的好处是：

1. 保持与项目其他样式变量的一致性
2. 方便后续主题定制
3. 提高代码可维护性

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between d107304 and 4d88a1f.

📒 Files selected for processing (1)

• src/packages/table/table.scss (1 hunks)