feat: [Design] Import models via click, drag & drop functionality

[0xSage]

Problem A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Success Criteria A clear and concise description of what you want to happen.

1. I go to settings > files (or whatever menu name) > model scan
2. I get a finder popup and select the folder
3. I see the correct progress/error states as this is being done
4. App is updated with these models
5. model.jsons are autogened

Additional context Add any other context or screenshots about the feature request here.