agent: Add several UX improvements (#29828)

Still a work in progress.

Release Notes:

- N/A

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Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>
Co-authored-by: Nathan Sobo <nathan@zed.dev>
Co-authored-by: Cole Miller <m@cole-miller.net>
Co-authored-by: Nathan Sobo <1789+nathansobo@users.noreply.github.com>
Co-authored-by: Cole Miller <53574922+cole-miller@users.noreply.github.com>
10a7f2a972Danilo Leal committed on 5/3/2025, 1:00:55 AM· committed by GitHubparent5053562
11 files changedLine totals unavailable