- implement the new UI and frontend logic of the Login screen
- integrate it (as a separate page) into the OnboardingLayout
- add SB pages
- add an integration QML test
- add some TODOs and FIXMEs for the existing and new external flows,
which will be covered separately in followup PRs
Fixes#17057
- extend the tests to verify whether we collected the correct data
- restore the "pointing hand" cursor on clickable elements
- some minor improvements