Update use case context scope defaults
Follow up to:
#3573715
## Problem/motivation
Based on UX review, we've settle on these defaults (alphabetical):
- Working with Canvas
- Working with Media
- Working with People
- Working with Text
## Solution
Update defaults and tests, and add a update hook.
## Tasks
- Update code
- Review and test
## AI usage disclosures
- [ ] AI assisted issue
- [ ] AI assisted code
- [x] AI generated code
issue