Add a "stop generation" button to chat.

[Majdoddin]

I am trying the online chat, sometimes it takes too long because of queuing. Sometimes it even seems it has hanged. That button would be very useful then.

[alexn-s]

i think this is a very important feature. sometimes i wait for 20 seconds when it generates a long text.

perhaps there even could be a "settings" page or toggle to cancel the generation when new text is entered and send (as a settings name: cancel generation on new text?)

[olliestanley]

Closing as covered by #2815. Although this issue was submitted first, the other one has already been added to the project board so it makes sense to retain it and close this one