- Added mergePermissions=false optional parameter to WriteSingleFileAsync
- Added early-return consolidated branch using PermissionConsolidator.Consolidate
- Consolidated CSV uses distinct header with Locations and LocationCount columns
- Locations column is semicolon-separated site titles for multi-location rows
- Existing non-consolidated code path is completely unchanged
- UserAccessAuditViewModel.ExportCsvAsync now passes MergePermissions to service
- BuildCsv per-user CSV with summary section (user, totals, sites, high-privilege, date)
- WriteAsync groups entries by UserLogin, writes one file per user (audit_{email}_{date}.csv)
- WriteSingleFileAsync combines all users in one file for SaveFileDialog export
- RFC 4180 CSV escaping, UTF-8 with BOM for Excel compatibility
- SanitizeFileName strips invalid path chars from email addresses