fix: useTextSelection

[junjunzzz]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
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🔗 Related issue link

useTextSelection从指定区域外划词至区域内会把区域外的文字也识别了

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	fix： useTextSlection to listen to specific area text selection
🇨🇳 Chinese	修复useTextSlection的监听特定区域文本选择

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
2 out of 3 committers have signed the CLA.

✅ junjunzzz
✅ hchlq
❌ crazylxr
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[junjunzzz]

修改前：

修改后：采取issues 评论中第一种方法

效果如下：

[hchlq]

@brickspert @crazylxr 辛苦有空一起帮忙看看~

[crazylxr]

LGTM