Self-contained dark-themed HTML report with summary stats, filter
buttons (pass/warn/fail/error), side-by-side image comparison per
route and viewport, lazy-loaded images, and full-size overlay on click.
The generator script reads report.json, converts absolute paths to
relative, and injects data into the template.
Extends the single-viewport screenshot-diff.ts pattern to capture at
3 viewports (desktop 1440, tablet 768, mobile 375), supports masking
dynamic content via CSS selectors, and outputs structured JSON report
to comparison-report/visual/ for downstream report generation.
Add pixelmatch-based screenshot comparison script that captures Angular
(:4200) and React (:8080) at every route and generates pixel diff images.
Dev server: add mock /api/appSettings endpoint so Angular can bootstrap
when WAF blocks the real API.