fix(transfer): use setter function for v-model:checked to emit update event

[Copilot]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

#6198

💡 需求背景和解决方案

使用 v-model:checked 时，勾选复选框报错：[Vue warn] Set operation on key "checked" failed: target is readonly.

<t-transfer
  v-model:value="targetValue"
  v-model:checked="checked"
  :data="listData"
/>

根因：useDefaultValue 返回 [Ref, Setter] 元组，但只解构了 Ref。当使用 v-model 时，返回的是父组件传入的只读 prop ref，直接赋值 innerChecked.value = checked 触发 Vue 警告。

修复：

• 解构 setInnerChecked setter 函数
• 用 setInnerChecked(checked) 替代直接赋值，正确触发 update:checked 事件

📝 更新日志

• 本条 PR 不需要纳入 Changelog

tdesign-vue-next

• fix(transfer): 修复 v-model:checked 无法正常工作的问题

@tdesign-vue-next/chat

@tdesign-vue-next/auto-import-resolver

☑️ 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
• Changelog 已提供或无须提供

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Transfer] 属性“checked”使用v-model语法糖失败</issue_title>
<issue_description>### tdesign-vue-next 版本

1.14.2

重现链接

No response

重现步骤

checked属性使用双向绑定

<t-transfer
  v-model:value="targetValue"
  v-model:checked="checked"
  :data="listData"
  @checked-change="handleCheckedChange"
/>

期望结果

勾选后父级checked变量更新勾选的值

实际结果

无法选中复选框

控制台报错：[Vue warn] Set operation on key "checked" failed: target is readonly.

框架版本

Vue 3.5.17

浏览器版本

No response

系统版本

No response

Node版本

22.17.0

补充说明

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Transfer] 属性“checked”使用v-model语法糖失败 #5766

---

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commit: dfcd779

[pkg-pr-new]

tdesign-vue-next-demo

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npm i https://pkg.pr.new/Tencent/tdesign-vue-next@6216

npm i https://pkg.pr.new/Tencent/tdesign-vue-next/@tdesign-vue-next/chat@6216

commit: e3549a4

[liweijie0812]

@copilot 使用 useVModel 修复

[Copilot]

@copilot 使用 useVModel 修复

Done in 34c6e09. Changed from useDefaultValue to useVModel for the checked prop, following the same pattern as value. Added a dummy checkedModelValue ref since checked doesn't have a corresponding modelValue prop.

[liweijie0812]

@copilot 撤销useVModel修改

[Copilot]

@copilot 撤销useVModel修改

Done in dfcd779. Reverted to using useDefaultValue with the setter function setInnerChecked instead of useVModel.

[tdesign-bot]

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