fix(checkbox): 列表模式切换选中态，布局错误

[oasis-cloud]

Closes #3164

Summary by CodeRabbit

• 样式
  • 优化了复选框视觉效果：将图标阴影效果拆分为独立样式，确保视觉层次更加清晰，同时保留了原有风格。
  • 调整了组件内部展示结构：图标采用统一容器包装，标签改为文本呈现，提升了整体渲染表现和用户体验。

[coderabbitai[bot]]

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Walkthrough

本次提交主要涉及两个方面的改动。一处是在样式文件中，将原有的 .nut-checkbox 中的 &-icon-wrap 样式重命名为 &-icon-wrap-shadow，同时新增一个与原 &-icon-wrap 样式相同的新类，从而将阴影效果与原始样式分离。另一处是在 Checkbox 组件中，对图标和标签的渲染逻辑进行了调整：图标统一用 View 包裹，标签改为使用 Text 组件，并移除了不必要的片段包装，以优化组件的结构。

Changes

文件	改动说明
src/.../checkbox/checkbox.scss	重命名 &-icon-wrap 为 &-icon-wrap-shadow，新增 &-icon-wrap 类以分离阴影样式
src/.../checkbox/checkbox.taro.tsx	图标使用 View 包裹，标签渲染改为 Text，移除多余的片段包装
src/.../checkbox/checkbox.tsx	将 div 元素的类名从 ${classPrefix}-icon-wrap 修改为 ${classPrefix}-icon-wrap-shadow

Sequence Diagram(s)

sequenceDiagram
    participant Checkbox as Checkbox组件
    participant IconRenderer as 图标渲染
    participant LabelRenderer as 标签渲染

    Checkbox->>IconRenderer: 调用 renderIcon()
    IconRenderer->>View: 用 View 包裹图标
    Checkbox->>LabelRenderer: 调用 renderLabel()
    LabelRenderer->>Text: 用 Text 渲染标签

Assessment against linked issues

Objective	Addressed	Explanation
修复 checkbox 和 radio 布局错乱 (#3164)	✅

Possibly related PRs

• jdf2e/nutui-react#2730: 该PR中的更改，特别是对 checkbox.scss 中CSS类的重命名以及在 checkbox.tsx 中的相应更新，与本PR中对 Checkbox 组件的修改直接相关。

Suggested reviewers

• xiaoyatong
• irisSong

Poem

我是一只快乐的小兔子，
跳跃间见到代码的新风采，
样式分离清晰明了，
渲染结构也变得优雅，
布局错乱从此远离，
跟着改动一起欢快跳跃～ 🐰✨

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.19%. Comparing base (cc94ce3) to head (c968861). Report is 6 commits behind head on feat_v3.x.

Additional details and impacted files

@@              Coverage Diff              @@
##           feat_v3.x    #3166      +/-   ##
=============================================
+ Coverage      87.18%   87.19%   +0.01%     
=============================================
  Files            279      279              
  Lines          18537    18544       +7     
  Branches        2820     2822       +2     
=============================================
+ Hits           16161    16170       +9     
+ Misses          2371     2369       -2     
  Partials           5        5              

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