Dev 3de737ac3f feat(07-04): implement UserAccessAuditViewModel ...

- Extends FeatureViewModelBase with RunOperationAsync calling IUserAccessAuditService.AuditUsersAsync
- People picker with 300ms debounced Graph search via IGraphUserSearchService.SearchUsersAsync
- SelectedUsers ObservableCollection<GraphUserResult> with AddUserCommand/RemoveUserCommand
- Results ObservableCollection<UserAccessEntry> with CollectionViewSource grouping (by user/site) and FilterText predicate
- Summary banner properties: TotalAccessCount, SitesCount, HighPrivilegeCount (computed from Results)
- ExportCsvCommand/ExportHtmlCommand using UserAccessCsvExportService/UserAccessHtmlExportService
- Site selection with _hasLocalSiteOverride + OnGlobalSitesChanged pattern from PermissionsViewModel
- Dual constructors (DI + internal test constructor omitting export services)
- OnTenantSwitched resets all state (results, users, search, sites)

2026-04-07 12:44:02 +02:00

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