Updates the git connection dialog to reflect default agentic behavior,
followed by default keys and only then reverting to a custom selection
if the user desires
Fixes https://gitlab.com/kicad/code/kicad/-/issues/20204
Use enable/disable instead of show/hide to prevent large areas of blank
space in the dialog.
Set the minimum dialog size after the initial launch to prevent controls
from being cut off when resizing dialog to less than the initial size.
Fix static and dialog title bar string capitalization.
Add colons (:) to the end of description static text controls as is done
elsewhere in KiCad.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/20045
