- Add IBrandingService field and DI constructor parameter to all 5 ViewModels
- Add optional IBrandingService? parameter to test constructors (PermissionsViewModel, StorageViewModel, UserAccessAuditViewModel)
- Assemble ReportBranding from GetMspLogoAsync + _currentProfile.ClientLogo before each WriteAsync call
- Pass branding as last parameter to WriteAsync in all ExportHtmlAsync methods
- Guard clause: branding assembly skipped (branding = null) when _brandingService is null (test constructors)
- Build: 0 warnings, 0 errors; tests: 254 passed / 0 failed / 26 skipped
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