fix(components): 修复@trao/components swiper组件销毁时的报错

[niljie]

这个 PR 做了什么？ (简要描述所做更改)

TypeError. Cannot read properties of undefined (reading 'children'). in e.loopDestroy at line 2:60102

Swiper 在 circular 模式下，外部子节点变化时会先调用 loopDestroy() 恢复 DOM 顺序，再重新初
始化。
但在某些场景下，Swiper 内部的 wrapper 节点可能已经被移除或重置，此时继续调用 loopDestroy()
会导致 Swiper 内部访问 wrapper children 时抛错。

这个 PR 是什么类型？ (至少选择一个)

• 错误修复 (Bugfix) issue: fix #
• 新功能 (Feature)
• 代码重构 (Refactor)
• TypeScript 类型定义修改 (Types)
• 文档修改 (Docs)
• 代码风格更新 (Code style update)
• 构建优化 (Chore)
• 其他，请描述 (Other, please describe):

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• Web 端（H5）
• 移动端（React-Native）
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Summary by CodeRabbit

发布说明

• Bug 修复
  • 改进了轮播组件的稳定性，添加了初始化检查机制，防止在组件尚未完成初始化时出现异常。

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a25745da-74c3-4573-9a35-e76a2c700ce6

📥 Commits

Reviewing files that changed from the base of the PR and between 0db37ec and 775d211.

📒 Files selected for processing (2)

• packages/taro-components/__tests__/swiper.spec.tsx
• packages/taro-components/src/components/swiper/swiper.tsx

---

Walkthrough

在 watchSwiperWrapper 方法中新增一行对 this.swiper.wrapperEl 的空值判断，当其不存在时直接返回。同时在测试文件中新增一个测试用例，验证该场景下 loopDestroy 不会被调用。

Changes

wrapperEl 空值保护及测试

Layer / File(s)	Summary
wrapperEl 空值保护实现与测试 packages/taro-components/src/components/swiper/swiper.tsx, packages/taro-components/__tests__/swiper.spec.tsx	watchSwiperWrapper 在执行后续逻辑前新增 wrapperEl 存在性检查，不存在时提前返回；测试用例模拟 circular: true、params.loop: true 且 wrapperEl 为空的场景，断言 loopDestroy 未被调用、appendChild 正常插入子元素。

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐇 小兔蹦蹦跳，循环滑块要检查，
wrapperEl 若为空，直接把路堵啦~
loopDestroy 不乱跑，测试验证无差，
一行守护代码，平安迎春花！✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	PR标题准确总结了主要变更：修复swiper组件销毁时的报错问题，与代码变更内容（在watchSwiperWrapper中添加wrapper判定以避免错误）完全对应。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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