[Feature] Cancle button in Dijkstra GPT

[KRYSTALM7]

Users should be able to click a "Cancel" or "Stop Generation" button to halt response generation immediately.

⚠️ Note:

• For documentation issues, please open an issue in Dijkstra-Edu/docs.
• For discussions or proposals, please create a GitHub Discussion.

[JRS296]

Try to mimic the same behaviour as ChatGPT