Clone-fidelity fix waves 1-3 (+ wave 4 in flight): capture settling, media, iframes

Fixes from the cropin.com / ooni.com audit reviews:
- walker: preserve whitespace-only text in inline elements ("ofthe" bug);
  capture ::placeholder styles for inputs
- css: emit visibility (hidden-at-rest wordmark artifact); exempt list
  markers from inherited elision (lost bullets); ::placeholder rules
- seo: sanitize og:type to Next's enum (render crash -> dev badge leak);
  generated next.config disables devIndicators
- capture/stabilize: promote lazy-loader data attrs before snapshots
  (collapsed sections, viewport-inconsistent captures); settle autoplay
  carousels to home slide before every snapshot; force-reveal hidden
  videos for poster shots + log failures
- generate: ship downloaded video files as local <video src>; keep
  picture>source through IR prune with srcset rewrite (mobile-crop-on-
  desktop heroes); pin Tailwind named screens to computeBands boundaries
- capture/graft: capture cross-origin iframe subtrees (Klaviyo signup
  forms) with element-screenshot fallback; asset download retry +
  visual-assets-missing reporting

Checkpoint commit: wave 4 (reveal settling, 206 range-response fix,
hidden-geometry banding, bare-zero utility gating) is mid-implementation.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

compiler/src/site/generateSite.ts

@@ -438,6 +438,7 @@ export function generateSiteApp(opts: {
     const globals = tailwindGlobalsCss({
       reset: RESET_CSS, fontCss: unionFontCss(routes), tokensCss, htmlBg, bodyFont: SYSTEM_FALLBACK, clip,
       colorTokens: [...interner.tokens], viewports: entry.ir.doc.viewports,
+      canonical: entry.ir.doc.canonicalViewport,
     });
     writeText(join(appDir, "src", isVite ? "globals.css" : join("app", "globals.css")), isVite ? viteGlobalsCss(globals) : globals);
   } else {