Add a "Stop Answering" Button

We're finding that when we're chatting with the AI, sometimes we realize halfway through its response that we either got what we needed or want to ask something completely different. Right now, we just have to wait for it to finish typing out the entire answer, which can be frustrating and wastes time.

It would be really helpful if we could have a "Stop" or "Cancel" button that shows up while the AI is still generating its response. When we click it, the AI should immediately stop typing, but we'd still want to keep whatever partial answer it already gave us in case there was something useful in there.

This would make our conversations with the AI feel much more natural and give us better control over the interaction flow.