Confirmation dialog for deleting a branch should use the "Destructive action" button styling instead of "Suggested action"
When you want to delete a branch, you get this blue button in the confirmation dialog:
...but presumably it should be the "destructive" action HIG button style instead?
Bonus points: that dialog's text could be improved to not have everything duplicated/redundant between title and contents. Maybe the title should be "Confirm branch deletion" and leave the branch name to the description, and use some quotation marks and markup (ex: <i>"%s"</i>
) for the branch name?
Tested with the 45.alpha version from flathub.