feat(performance): Core Web Vitals optimizations

- Font optimization: Replace @font-face with next/font/google (DM Sans, Inter) for faster font loading and no render-blocking
- Image optimization: Add Unsplash to remotePatterns, configure AVIF/WebP formats, add device/image sizes
- Convert native <img> tags to next/image with proper sizing and priority for LCP images
- Add optimizePackageImports for lucide-react and framer-motion to reduce bundle size
- Fix CLS: Urgency message uses fixed min-height instead of animated height
- Fix CLS: ProductCard quick-add button uses opacity instead of translate for hover
- Convert HeroVideo scroll indicator to CSS animation
- Script loading: Rybbit uses lazyOnload strategy for better INP

next.config.ts

@@ -31,6 +31,9 @@ const nextConfig: NextConfig = {
     ];
   },
   images: {
+    formats: ["image/avif", "image/webp"],
+    deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048],
+    imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],
     remotePatterns: [
       {
         protocol: "https",
@@ -52,8 +55,16 @@ const nextConfig: NextConfig = {
         hostname: "**.saleor.cloud",
         pathname: "/**",
       },
+      {
+        protocol: "https",
+        hostname: "images.unsplash.com",
+        pathname: "/**",
+      },
     ],
   },
+  experimental: {
+    optimizePackageImports: ["lucide-react", "framer-motion"],
+  },
 };
 
 export default withNextIntl(nextConfig);