fix: 🐛 修复textarea统计多码元字符长度错误的问题

[RJQingHuan]

🤔 这个 PR 的性质是？(至少选择一个)

• 日常 bug 修复
• 新特性提交
• 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
• CI/CD 改进
• 包体积优化
• 性能优化
• 功能增强
• 国际化改进
• 代码重构
• 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

close #933

💡 需求背景和解决方案

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⚠️ 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

Summary by CodeRabbit

• Bug Fixes
  • 改进了文本区域字符计数功能，确保在输入多字节字符（如中文、表情符号等）时能够准确统计字符数量，提升用户体验。

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[coderabbitai]

Walkthrough

该 PR 修改了 wd-textarea 组件中 currentLength 的计算方式。从原先直接获取字符串长度改为使用 Array.from 方法对格式化后的值进行处理，以正确统计多字节字符的长度。同时代码中添加了中文注释并附上了问题链接，公共实体的声明未发生变化。

Changes

文件	变更摘要
src/uni_modules/.../wd-textarea/wd-textarea.vue	修改 currentLength 计算逻辑，使用 Array.from 处理多字节字符，添加中文注释和问题链接。

Possibly related PRs

• fix: 🐛 wd-textarea组件maxlength限制长度无效 #558 - 修改了 wd-textarea 组件中 currentLength 的计算方式，确保格式化值长度的准确计算。
• fix: 🐛 修复Input、Textarea未设置labelWidth时通过CSS变量设置label宽度无效的问题 #591 - 针对 wd-textarea 组件进行了调整，其中包含对 currentLength 及 labelWidth 的相关修改，二者在组件中存在交集。

Suggested reviewers

• Moonofweisheng

Poem

我是一只跳跃的小兔子，
在代码林间自由穿行，
多字节字符不再迷路，
精准计算写下新章，
代码花园春意盎然，
让我们一起欢笑前行！ 🐇🌸

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📥 Commits

Reviewing files that changed from the base of the PR and between 7478939 and 9e1180b.

📒 Files selected for processing (1)

• src/uni_modules/wot-design-uni/components/wd-textarea/wd-textarea.vue (1 hunks)

🔇 Additional comments (1)

src/uni_modules/wot-design-uni/components/wd-textarea/wd-textarea.vue (1)

173-179: 很好的修复，正确处理了多字节字符的长度计算！

这个修改使用 Array.from() 方法来正确计算字符串长度，解决了 JavaScript 中字符串 .length 属性只计算 UTF-16 编码单元数而非用户感知字符数的问题。对于表情符号、复杂汉字等多字节字符，这种方法能确保每个字符被正确计为一个单位，从而修复了文本长度限制的统计错误。

代码添加的注释清晰地解释了修改原因并提供了问题链接，非常有助于后续维护。

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