Perf/cold start and lighthouse protocol#48
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…d SEO Performance (CLS): - Replace flat skeleton with card-shaped skeleton matching actual grid layout (same columns, aspect-square image area, text/button stubs) to eliminate the skeleton→content layout shift that caused CLS 0.60 - Add width/height attributes to product images so the browser reserves space before the network response arrives - Add <picture> + <source type="image/webp"> to both product-list and product-details; convert all three product PNG assets to WebP (92–95% size reduction: 433 KB → 31 KB for the largest image) Accessibility: - h1 → h2 for "Premium Collection" heading in product-list (was creating a duplicate h1 when embedded in the home page) - h3 → h2 for "Description" label in product-details (h1 → h3 skip) - Add aria-label + title to the icon-only add-to-cart button - Add aria-label to quantity −/+ buttons in product-details - Add type="button" to all non-submit buttons - footer text-slate-400 → text-slate-600 (contrast ratio 2.6 → 5.9) - product-details "Description" label text-slate-400 → text-slate-600 SEO: - Add <meta name="description"> to index.html - Add robots.txt to public/ (nginx was serving index.html fallback) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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