Model download progress is badly reflected in the setup UI

[aagedal]

Both Transcription Engine and Summarization engine progress quickly jumps to 85%, but stays there for a long time. Looking at the debug logs it seems that all download progress happens during this 85% step in the main UI.

[ruzin]

@aagedal would you like to make a PR for this and be a contributor to the project? Its a good first issue