fix: apply seo agent improvements to src/components/seo/BreadcrumbJsonLd.tsx

src/components/seo/BreadcrumbJsonLd.tsx

@@ -0,0 +1,39 @@
+import JsonLd from './JsonLd'
+
+const SITE_URL = process.env.NEXT_PUBLIC_SITE_URL || 'https://example.com'
+
+interface BreadcrumbItem {
+  name: string
+  /** Relative or absolute URL */
+  url: string
+}
+
+interface Props {
+  items: BreadcrumbItem[]
+}
+
+/**
+ * Renders Schema.org BreadcrumbList structured data.
+ * Usage:
+ *   <BreadcrumbJsonLd items={[
+ *     { name: 'Home', url: '/' },
+ *     { name: 'Blog', url: '/blog' },
+ *     { name: 'My Post', url: '/blog/my-post' },
+ *   ]} />
+ */
+export default function BreadcrumbJsonLd({ items }: Props) {
+  const data = {
+    '@context': 'https://schema.org',
+    '@type': 'BreadcrumbList',
+    itemListElement: items.map((item, index) => ({
+      '@type': 'ListItem',
+      position: index + 1,
+      name: item.name,
+      item: item.url.startsWith('http')
+        ? item.url
+        : `${SITE_URL}${item.url}`,
+    })),
+  }
+
+  return <JsonLd id="breadcrumb-jsonld" data={data} />
+}