Enhance product detail page and header with API-driven navigation.

Add gallery lightbox, tabs, marketplace CTAs, and similar products on product pages; load the business logo and level-2 category dropdown in the header.

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

src/components/SiteShell.tsx

@@ -1,5 +1,5 @@
 import { Footer } from "@/components/Footer";
-import { Header } from "@/components/Header";
+import { HeaderContainer } from "@/components/HeaderContainer";
 import { PageBanner } from "@/components/PageBanner";
 
 type SiteShellProps = {
@@ -19,7 +19,7 @@ export function SiteShell({
 }: SiteShellProps) {
   return (
     <>
-      <Header forceSolid={solidHeader} />
+      <HeaderContainer forceSolid={solidHeader} />
       <main className={solidHeader ? "pt-[4.5rem]" : undefined}>
         {banner ? (
           <PageBanner