- Convert User column to DataGridTemplateColumn with orange 'Guest' pill badge on IsExternalUser=true
- Add ObjectType DataGridTextColumn between Object and Permission Level
- Convert Permission Level column to DataGridTemplateColumn with red warning icon on IsHighPrivilege=true
- Register IUserAccessAuditService, IGraphUserSearchService, export services, ViewModel and View in App.xaml.cs
- Create UserAccessAuditView.xaml with two-panel layout: people picker, site picker, scan options, color-coded DataGrid with grouping, summary banner
- Create UserAccessAuditView.xaml.cs code-behind with ViewModel constructor injection
- [Rule 3] UserAccessAuditView was missing (07-05 not executed); created inline to unblock 07-07
- Two-panel layout (290px left + * right) following PermissionsView pattern
- Left panel: people picker with autocomplete list + removable user pills, site picker button, scan option checkboxes, run/cancel/export buttons
- Right panel: 3-card summary banner (TotalAccessCount, SitesCount, HighPrivilegeCount), filter TextBox, group-by ToggleButton, color-coded DataGrid
- DataGrid: color-coded rows by AccessType (Direct=blue, Group=green, Inherited=gray), warning icon for high privilege, Guest badge for external users, access type icons
- GroupStyle with Expander headers showing group name + item count
- Status bar with ProgressBar + StatusMessage
