Can't switch selection between changes using keyboard arrows after staging one change

[Natan-Gorecki]

Steps to reproduce:

• I created new git repository with 3 unstaged changes.
  
• Stage first change (text1.txt) using Space/Enter.
  
• Next change is properly selected (text2.txt), but we can't switch to another item using keyboard arrows.
• To propagate properly focus we need to click to change (text2.txt) using left mouse button. After that we can use arrows again.
• It affects both unstaged and staged views.

Environment:

• SourceGit 2025.18
• Linux Mint 22.1 Cinnamon

[love-linger]

Done. You can download the latest CI build from Github Action.