No "on error" messages

[Torxed]

Things can crash in the background and the user won't know about it.
Adding a notification message early in the catch logic would at least send something to the user and perhaps avoid "spinning progress of death".

[Torxed]

There's support for this in the code via the log function now, but there's no error log function currently. This is mainly a limitation in archinstall currently. So we'll need to implement a proper log-flow there, before we can pick up errors.

Once that is done, I suggest a huge popup that covers the screen with a blurred background, to make sure the user can not accidentally click on any subsequent steps until the error dialogue is confirmed and closed.