Simplified measurement insertion

Simplifies the data entry UX by creating dedicated UI for each element, removing the wizards.

**DO NOT MERGE until this list is done**

- [x] visualization views
- [x] update context menus (use the same action as for the simplified flow)
- [x] browser `+`
- [x] Source assignment in `Measurements`
- [x] select added entities
- [x] disclose to show added files