fix frontend : highlight active assistant text and maintain chat seq | for #476

[808vita]

highlight active assistant text and maintain chat seq

new typing seq.webm

for #476 This PR instead of #531

[808vita]

needs some wrangling to find bugs. note: potential for bugs resides in side effects (useEffects).

[rbren]

This is working great!

The one bug I see is that if it prints several lines, the go below the fold, and you have to scroll down to see the full message

[rbren]

[808vita]

@rbren I have added a new commit which alters the autoscroll behaviour.

new autoscroll.webm

[rbren]

👍 let's get this one in

[rbren]

Thanks for the fix!