Hide additional context scope options if global is selected
Follow up to:
#3573715
## Problem/motivation
"When the Global context toggle is enabled, hide all other context-scoping options (use cases, target, conditional settings, and any other fields that narrow where or when the item applies). A global Context Item applies everywhere by definition, so these fields are irrelevant in that state and add cognitive noise. Reveal them only when the toggle is off."
## Solution
Hide all other scope options when global is selected.
## Tasks
- Update code
- Review and test
## AI usage disclosures
- [ ] AI assisted issue
- [ ] AI assisted code
- [x] AI generated code
issue