feat(website): redesign the mobile experience

Replace the stacked desktop layout with a phone-first product flow featuring an image-led hero, inline privacy proof, compact semantic search, swipeable feature cards with live pagination, expandable technical details, and touch-friendly navigation and calls to action. Add the standalone Phokus aperture SVG asset.

website/src/styles/index.css

@@ -47,11 +47,18 @@ body {
   text-rendering: optimizeLegibility;
 }
 
-a:focus-visible {
+a:focus-visible,
+summary:focus-visible {
   outline: 2px solid var(--color-amber);
   outline-offset: 4px;
 }
 
+@media (max-width: 63.999rem) {
+  section[id] {
+    scroll-margin-top: 6.25rem;
+  }
+}
+
 @media (prefers-reduced-motion: reduce) {
   html {
     scroll-behavior: auto;