git_ui: Git panel polish (#25164)

- Hides header when no active repo/no repo
- Entire commit editor now has i-beam cursor on hover
- Adds an icon to the project diff tab

Release Notes:

- N/A

Nate Butler committed 1y ago

086f002f44bb7561a0ee16bcdbf88878ff1357d4

Parent: c0c48d3

Committed by GitHub <noreply@github.com> on 2/19/2025, 3:33:41 PM