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

src/app/globals.css

@@ -53,8 +53,7 @@
   --color-cta-hover: #333333;
   --color-overlay: rgba(0, 0, 0, 0.4);
   
-  --font-display: 'DM Sans', sans-serif;
-  --font-body: 'Inter', sans-serif;
+  /* Font variables will be set by next/font in layout.tsx */
   
   --transition-fast: 150ms ease;
   --transition-base: 250ms ease;
@@ -66,26 +65,9 @@
   --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
 }
 
-/* ============================================
-   FONT IMPORTS
-   ============================================ */
-
-@font-face {
-  font-family: 'DM Sans';
-  src: url('https://fonts.gstatic.com/s/dmsans/v15/rP2tp2ywxg089UriI5-g4vlH9VoD8CmcqZG40F9JadbnoEwAopxhS2f3ZGMZpg.woff2') format('woff2');
-  font-weight: 400 700;
-  font-display: swap;
-}
-
-@font-face {
-  font-family: 'Inter';
-  src: url('https://fonts.gstatic.com/s/inter/v18/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfAZ9hjp-Ek-_EeA.woff2') format('woff2');
-  font-weight: 400 700;
-  font-display: swap;
-}
-
 /* ============================================
    BASE STYLES (in Tailwind base layer)
+   Fonts loaded via next/font in layout.tsx
    ============================================ */
 
 @layer base {
@@ -266,6 +248,19 @@
   }
 }
 
+/* ============================================
+   SCROLL INDICATOR ANIMATION
+   ============================================ */
+
+@keyframes scrollBounce {
+  0%, 100% { transform: translateY(0); }
+  50% { transform: translateY(8px); }
+}
+
+.scroll-indicator {
+  animation: scrollBounce 1.5s ease-in-out infinite;
+}
+
 /* ============================================
    UTILITIES
    ============================================ */