Ability to stop/resume downloading a model and to delete partial downloads

# What I'd like
As a user, I want to be able to
- stop a current language model download,
- resume a stopped download,
- delete a stopped/partial download

# What I did
I was exploring audapolis for the first time. I started downloading both the small and the big German model.
While the big model was still downloading, I tried to transcribe a file.
This crashed because i had a full disk (because of the big model still downloading):

I was still able to use the application (it didn't hang or smth), but I cannot see how to stop and remove the partial download of the big German model: