Fix chat message streaming and autoscrolling

[CJBuzz]

Problem

Responses from LLM in the chat section comes out in blocky chunks. The chat section also only scrolls down after the entire message has been sent.

Link to Issue:

Issue

Changes

Responses now appear letter by letter, mimicking a "typing" style. Auto-scrolls down while message is being "typed".

Why

Changes are made for better UI

Testing

Local testing was done.

[CJBuzz]

Hi, currently when the user enters another prompt to the chatbot while the response from the previous prompt is still generating, the generating response will be removed entirely. Is that the desired behavior?

Alternatives include

1. Stop the typing animation of the previous response and immediately display it in full, then continue with the new prompt.
2. Continue generating the previous message (including with typing animation), then continue with the new prompt.