feat: smooth scrolling

[samdenty]

This PR adds smooth scrolling using the lightweight use-stick-to-bottom NPM package.

On the master branch there exists a layout shift of the messages (with the existing hook) which should be fixed ideally in another PR to ensure this package can work reliably

[vercel[bot]]

@samdenty is attempting to deploy a commit to the Uncurated Tests Team on Vercel.

A member of the Team first needs to authorize it.