Improve error reporting on Mobile wizards

[kahest]

Right now, errors we capture are not very granular/actionable. We should e.g. add more try/catches around specific steps and capture more specific/granular errors. (e.g. like for Nuxt here). The goal is to know which step of the wizard flow failed for which reason.

This helps in 2 ways:

• find out most common errors
• fix them

Priority:

• [ ] Flutter