Part of [ENG-9959](https://linear.app/comm/issue/ENG-9959/improve-scanning-qr-code-flow).
Tracked in [ENG-10025](https://linear.app/comm/issue/ENG-10025/make-qr-flow-darklight-theme-consistent-with-registration-flow).
Rendered all possible button variants in this order:
- `enabled`
- `disabled`
- `loading`
- `outline`
- `danger`
Light theme:
{F3481426}
Dark theme:
{F3481427}
Depends on D14159