Add replaceable images, category mega menu, and contact pages.

Give every placeholder a real img src, add FAQ and contact sections, and put categories first in the header.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/Icons.tsx

@@ -126,6 +126,14 @@ export function IconPalette({ className = "size-7" }: IconProps) {
   );
 }
 
+export function IconChevronDown({ className = "size-4" }: IconProps) {
+  return (
+    <svg className={className} viewBox="0 0 24 24" fill="none" aria-hidden>
+      <path d="m6 9 6 6 6-6" stroke="currentColor" strokeWidth="1.8" strokeLinecap="round" />
+    </svg>
+  );
+}
+
 export function IconChevron({ className = "size-5" }: IconProps) {
   return (
     <svg className={className} viewBox="0 0 24 24" fill="none" aria-hidden>