Login flow v2

[rapterjet2004]

• fixes #4711

🖼️ Screenshots

🚧 TODO

• [x] Got it working
• [ ] Add Cancel button
• [ ] Add better error handling
• [ ] Remove old approach

🏁 Checklist

• [ ] ⛑️ Tests (unit and/or integration) are included or not needed
• [ ] 🔖 Capability is checked or not needed
• [ ] 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• [ ] 📅 Milestone is set
• [ ] 🌸 PR title is meaningful (if it should be in the changelog: is it meaningful to users?)