🐛 [Bug]: Mention 组件的联想文字选中后应替换触发输入的联想文本，而非追加

[Muluk-m]

Version

1.0.1

Vue Version

3.2

Link to minimal reproduction

https://vue-devui.github.io/components/mention/

Step to reproduce

1. 输入@v
2. 点击hint中的“Vue”
   

What is expected

预期输入框中显示 @Vue

What is actually happening

实际输入框中显示 @vVue

Any additional comments (optional)

我认为这并非预期结果，我参考了antd的同功能组件，他们的实际效果更符合期望

[kagol]

Fixed by @handsomezyw on #1301