the light model UI looks much better than the dark mode - why?
spacing is probably inconsistent
the Collection view is too busy at the top, with the title input field, the search field right below it, all the buttons, the Documents with their own buttons, etc.
maybe some smaller buttons with icons instead of text? Maybe they don't look like buttons as much, sort of the like the GitHub gear icons for changing assignees, labels, etc., right on this Edit Issue page?
design is just based on other AI chat UIs with a list of convos (or collections) on the left; maybe rethink this? If Chat happened inside Collections, could we drop the separate Chat view?
red on black is low contrast and looks bad - new colour?
having separate red and blue Collection and Chat views is weird.
Some things that are not great about the UI: