feat: support copy to clipboard

[yaocccc]

I hava create a PR for support

1. ctrl+y to copy last answer to clipboard
2. ctrl+n/p to set textarea use history(next/prev)

[j178]

@yaocccc Hi, thanks! mostly looks good to me, can you make ctrl+n/p to set textarea use history(next/prev) as a separate PR?

[yaocccc]

@yaocccc你好谢谢！对我来说大部分看起来不错，你可以作为ctrl+n/p to set textarea use history(next/prev)一个单独的公关吗？

yep，wait me sometimes

[yaocccc]

不对啊。。迟点拆分下

[yaocccc]

please merge this pr.

Then I can create other