Fix: Pass photo request ID instead of data URL

Changed approach to pass customRequestId query parameter instead of
the full data URL. The design canvas page now fetches the photo from
the database using the request ID, avoiding URL length issues and
making the URL cleaner.

src/app/made-to-order/[slug]/page.tsx

@@ -12,7 +12,7 @@ export default async function ProductDetailPage({
   searchParams,
 }: {
   params: { slug: string };
-  searchParams: { customPhoto?: string };
+  searchParams: { customRequestId?: string };
 }) {
   const activePromotions = await fetchActivePromotions();
 
@@ -27,9 +27,20 @@ export default async function ProductDetailPage({
   });
   const related = relatedRows.map((p) => toProductDTO(p, activePromotions));
 
+  // Fetch custom photo from request if customRequestId is provided
+  let customPhoto: string | undefined;
+  if (searchParams.customRequestId) {
+    const customRequest = await prisma.customRequest.findUnique({
+      where: { id: searchParams.customRequestId },
+    });
+    if (customRequest) {
+      customPhoto = customRequest.imageDataUrl;
+    }
+  }
+
   return (
     <div className="mx-auto max-w-6xl px-6 py-12">
-      <DesignCanvas product={product} customPhoto={searchParams.customPhoto} />
+      <DesignCanvas product={product} customPhoto={customPhoto} />
 
       {related.length > 0 && (
         <section className="mt-20 border-t border-line pt-12">