修复Cascader动态加载层级不存在报错导致不显示内容的问题，及Popup关闭按钮点穿的问题

[clayzx]

🤔 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

• Bug Fixes
  • 级联选择：修复懒加载过程中父节点未就绪导致的报错与选项渲染异常，提升稳定性与加载可靠性。
  • 弹窗：修复点击关闭图标会冒泡触发上层点击事件的问题，避免误触导致的意外关闭或重复回调，使交互更一致。

[coderabbitai[bot]]

Walkthrough

对 Cascader 懒加载链式归并中对子节点赋值增加了父节点空值保护；对 Popup 的关闭图标点击事件添加了 stopPropagation，避免冒泡影响其他点击逻辑。对外导出未变更。

Changes

Cohort / File(s)	Summary
Cascader 懒加载空值保护 src/packages/cascader/cascader.taro.tsx	在 reduce 流程中为 parent.children = pane 增加判空：改为 if (parent) parent.children = pane，避免 parent 未定义时报错；其余逻辑保持不变。
Popup 关闭图标点击处理 src/packages/popup/popup.taro.tsx	在 handleCloseIconClick 中加入 e.stopPropagation()，防止点击关闭图标触发外层（如遮罩）点击处理；后续仍执行 onCloseIconClick(e) && close()。

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor U as 用户
  participant CI as CloseIcon(关闭图标)
  participant PH as Popup(容器/遮罩)
  participant H as 处理器

  U->>CI: click
  note right of CI: 新增：stopPropagation()
  CI->>H: onCloseIconClick(e)
  alt 返回真
    H->>PH: close()
  else 返回假
    H-->>U: 不关闭
  end

  U->>PH: click(遮罩)
  PH->>PH: overlay onClick
  PH->>PH: close()

sequenceDiagram
  autonumber
  participant C as Cascader
  participant R as reduce(懒加载链)
  participant P as parent(可能为undefined)
  participant N as pane(子节点)

  C->>R: 迭代构建层级
  R->>P: 取得当前父节点
  alt P 存在
    R->>P: P.children = N
  else P 不存在
    note right of R: 新增空值保护：跳过赋值
  end
  R-->>C: 返回最终 options
  C->>C: setInnerOptions(...)

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• jdf2e/nutui-react#2944 — 同触达点：修改 src/packages/popup/popup.taro.tsx 的关闭图标点击处理（该 PR对处理器进行重命名与简化），与本次添加 stopPropagation() 的变更紧密相关。

Suggested reviewers

• oasis-cloud
• irisSong
• xiaoyatong

Poem

小兔拍耳听风声，
级级懒载护父根。
关窗一按不外传，
泡泡静落夜色深。
代码轻拢无惊雷，
行间稳当赴清晨。

✨ Finishing Touches

• [ ] 📝 Generate Docstrings

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• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 88.15%. Comparing base (52d84bd) to head (7ddeab9).

Additional details and impacted files

@@            Coverage Diff             @@
##           feat_v3.x    #3354   +/-   ##
==========================================
  Coverage      88.15%   88.15%           
==========================================
  Files            291      291           
  Lines          19212    19212           
  Branches        2988     2988           
==========================================
  Hits           16937    16937           
  Misses          2269     2269           
  Partials           6        6           

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