BUG: onboarding has multiple bugs/inconsistencies

### Is there an existing issue for this?

- [x] I have searched the existing issues

### What happened?

Onboarding section has multiple inconsistencies:

1. validation error when folder is not selected (#994 )
2. layout shifts going from step 1 to step 2 resulting in bad ux
3. progress is already 33% on first step and 67% on second step, i haven't even pressed next or filled the form so how is that progress? starting point should be 0%
4. last step has "next" instead of "done"

before: (cant directly upload videos in issues)

https://vimeo.com/1152728485?share=copy&fl=sv&fe=ci

after:

https://vimeo.com/1152728466?share=copy&fl=sv&fe=ci

### Record

- [x] I agree to follow this project's Code of Conduct