- Add _settingsService and _ownershipService fields to PermissionsViewModel
- Add SettingsService? and IOwnershipElevationService? to both constructors
- Add DeriveAdminUrl internal static helper for admin URL derivation
- Add IsAccessDenied helper catching ServerUnauthorizedAccessException + WebException 403
- Add IsAutoTakeOwnershipEnabled async helper reading toggle from SettingsService
- Refactor RunOperationAsync with try/catch elevation pattern (read toggle before loop)
- Tag elevated entries with WasAutoElevated=true via record with expression
- Add PermissionsViewModelOwnershipTests (8 tests): toggle OFF propagates, toggle ON elevates+retries, no elevation on success, WasAutoElevated tagging, elevation throw propagates, DeriveAdminUrl theory
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