Get all available format variants for an image path. Returns a map with :original, :webp, and :avif paths. Useful for preloading or manual format selection.

Fixed vertical gradient from codec-owned, validated three-row color samples. Invalid or unavailable metadata has no CSS representation.

Smallest catalog candidate for a progressive image. Sized local renditions preserve responsive source selection independently of progressive display.

Replace file extension. e.g., ‘img/foo.jpg’ -> ‘img/foo.webp’

Determine if we should generate modern format sources for this image. Skip for: - SVG files (already vector-based) - External URLs other than our versioned, converted Supabase avatars - URLs with query strings (likely already proxied/optimized) - Favicons and app icons - Uncatalogued modern formats (WebP, AVIF)