feat(picker): 为当前选中的 picker-roller-item 新增类名

[AnxysUaen]

这个 PR 做了什么? (简要描述所做更改)

为 Picker 组件备选项中的当前选中项新增 nut-picker-roller-item-selected 类名，便于为当前项配置自定义样式

这个 PR 是什么类型? (至少选择一个)

• feat: 新特性提交
• fix: bug 修复
• docs: 文档改进
• style: 组件样式/交互改进
• type: 类型定义更新
• perf: 性能、包体积优化
• refactor: 代码重构、代码风格优化
• test: 测试用例
• chore(deps): 依赖升级
• chore(demo): 演示代码改进
• chore(locale): 国际化改进
• chore: 其他改动（是关于什么的改动？）

这个 PR 涉及以下平台:

• NutUI H5 @nutui/nutui
• NutUI Taro @nutui/nutui-taro

这个 PR 是否已自测:

• 自测 Vite 脚手架使用 测试仓库
• 自测 Taro 脚手架使用小程序 & Taro-H5 测试仓库

Summary by CodeRabbit

• 新功能
  • 添加了选择功能，通过当前索引来高亮显示选择项。

[coderabbitai]

Walkthrough

此更改在Column.vue中引入了一个新函数isCurrPick，用于基于当前索引进行选择高亮显示，并将该函数添加到导出的实体中。

Changes

文件路径	更改摘要
src/packages/.../Column.vue	引入并导出函数isCurrPick

Poem

小兔带来新功能，
isCurrPick闪亮舞动。
高亮选中更直观，
列表索引轻松查。
🎉📝✨

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[coderabbitai]

Actionable comments posted: 0

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 21ec9c8 and 6d03e06.

Files selected for processing (1)

• src/packages/__VUE/picker/Column.vue (3 hunks)

Additional comments not posted (2)

src/packages/__VUE/picker/Column.vue (2)

27-28: 新增类名 nut-picker-roller-item-selected。

此更改看起来是正确的。isCurrPick 函数用于确定当前项目是否被选中。

---

221-223: 新增 isCurrPick 函数。

此函数用于检查给定索引是否与当前索引匹配，逻辑简单且实现正确。

[AnxysUaen]

#3106