- Added ReportBranding? branding = null to BuildHtml on all 5 services
- Added ReportBranding? branding = null after CancellationToken ct on all WriteAsync overloads
- Injected BrandingHtmlHelper.BuildBrandingHeader(branding) between <body> and <h1> in each
- StorageHtmlExportService both overloads updated (nodes-only and nodes+fileTypeMetrics)
- HtmlExportService both overloads updated (PermissionEntry and SimplifiedPermissionEntry)
- Build passes with 0 warnings — all existing callers compile unchanged via default null
- Replace string.Empty stub with full BuildHtml implementation
- Self-contained HTML with inline CSS and JS — no external dependencies
- toggle(i) JS function with collapsible subfolder rows (sf-{i} IDs)
- _togIdx counter reset at start of each BuildHtml call (per PS pattern)
- RenderNode/RenderChildNode for recursive tree rendering
- FormatSize helper: B/KB/MB/GB adaptive display
- HtmlEncode via System.Net.WebUtility
- Add explicit System.IO using (required in WPF project)
