agent: Simplify elements of the thread design (#29533)

Namely, this PR removes the layout shift when you click on a user
message to edit it and displays the feedback disclaimer only upon
hovering the thumbs up/down button container.

Release Notes:

- N/A
2a0be48875Danilo Leal committed on 4/28/2025, 2:36:06 PM· committed by GitHubparent1c4ba07
1 file changedLine totals unavailable