## Summary
UNLISTED views are personal views tied to a specific user, so API keys
should not be able to create them.
## Changes
- Added check in `canUserCreateView` to block API keys from creating
UNLISTED views
- Refactored the service to use smaller functions with early returns (no
nested if/else)
## Behavior Matrix
### Creating Views
| Caller | Visibility | Has VIEWS Permission | Result |
|--------|------------|---------------------|--------|
| User | UNLISTED | (not checked) | ✅ Allow |
| User | WORKSPACE | Yes | ✅ Allow |
| User | WORKSPACE | No | ❌ Denied |
| **API Key** | **UNLISTED** | (not checked) | **❌ Denied** |
| API Key | WORKSPACE | Yes | ✅ Allow |
| API Key | WORKSPACE | No | ❌ Denied |
