git_ui: Improve the branch picker when in the panel (#44408)

This PR adapts the design for the panel version of the branch picker.


https://github.com/user-attachments/assets/d04b612b-72e8-4bc9-9a19-9d466b9fe696

Release Notes:

- N/A
12dba5edbeDanilo Leal committed on 12/8/2025, 3:20:58 PM· committed by GitHubparent216a3a6
3 files changedLine totals unavailable