Pin message composer to the bottom of the new assistant panel (#11186)

Release Notes:

- N/A

---------

Co-authored-by: Marshall <marshall@zed.dev>
Co-authored-by: Nate <nate@zed.dev>
Co-authored-by: Kyle <kylek@zed.dev>
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>
1c09b69384Max Brunsfeld committed on 4/29/2024, 9:26:19 PM· committed by GitHubparentf842d19
7 files changedLine totals unavailable