fix(ci): Resolve HTML validation 404, Backstop missing references, and blog image optimization

lib/mdx.ts

@@ -57,6 +57,12 @@ export async function getProductMetadata(
   if (filePath && fs.existsSync(filePath)) {
     const fileContent = fs.readFileSync(filePath, 'utf8');
     const { data } = matter(fileContent);
+
+    // Filter out products without images to match getProductBySlug behavior
+    if (!data.images || data.images.length === 0 || !data.images[0]) {
+      return null;
+    }
+
     return {
       slug: fileSlug,
       frontmatter: {