support copy button for LLM response and text inside code fences

[ChetanKoneru]

Hi @ericdallo ,
Had to open a new PR

[ericdallo]

That works better @CsBigDataHub, some points:

• it only works for me clicking it, not when hitting enter like other eca buttons (not sure if you can use eca-buttonize which creates buttons whtat should work)
• there is a weird behavior, if I hold arrow to navigate in the chat, it stops when reaching the start of the code block, the funny thing is that if I go it starts working again until I move cursor to inside the code block again, check the video.

recording-2026-06-17.13.42.04.mp4

[ChetanKoneru]

@ericdallo, Thanks for the testing this. Fixed all these quirks.
Please re-test.

[ericdallo]

Works great now, thank you!

[ChetanKoneru]

Thanks