Add Copy Code When Done Generation button to code blocks

[jackschedel]

[cheeseonamonkey]

I think the copy button UI appears to be blocked entirely until the message is finished generating.

I notice this all the time but now I realize it's more complex than I thought, but it seems to happen when there are a lot of tokens:

1. fill up the chat with 3500+ tokens for a request
2. ask for some code with an explanation after
3. after the code block is finished, but before the message is finished, the copy button will not work or may lag for several seconds

[jackschedel]

i havent noticed this issue myself, might be poorly optimized or something. I'm basically always using the Electron version and on a pretty good computer. does this only happen on web/a bad pc?

[jackschedel]

im going to wait work on this issue until cheese's PR is done since it revamps code block implementation under the hood