assistant2: Render messages in the thread using a `list` (#21491)

This PR updates the rendering of the messages in the current thread to
use a `gpui::list`.

Release Notes:

- N/A

Marshall Bowers committed 1y ago

aca23da9714e0482be8bee1b56695ac3ff1d4cc6

Parent: db34f29

Committed by GitHub <noreply@github.com> on 12/3/2024, 9:25:09 PM