Please disable buttons on branch switching after they've been clicked during processing.

### The feature request

On creating a new branch with changes pending, GitHub Desktop currently displays a popup requesting information on how to handle both the branch base (current branch or main) and how to handle changes (bring across to new branch or stash in current). This screen currently has no progress indicator, and the buttons remain active during the processing.

### Proposed solution

I would like the popup buttons to become disabled while GitHub Desktop processes the commands behind the buttons, to avoid issues with repeatedly clicking the button and/or accidentally misclicking the next prompt's buttons without reading them.

### Additional context