{#-
Breadcrumb JSON-LD Structured Data Component

Emits a schema.org BreadcrumbList mirroring the visible breadcrumb trail
(navigation-components.html `breadcrumbs(page)`), so search engines and AI
crawlers understand the site hierarchy. Item URLs are absolute (origin +
path) via `| absolute_url`, matching the canonical/og:url surface.

Renders only when there are at least two crumbs (a single "Home" crumb is
not a meaningful trail) and structured_data.breadcrumb is enabled
(default: true).

Uses: get_breadcrumbs(page) → list of {title, href, is_current}
Uses site: baseurl (via | absolute_url)

Usage in base.html head:
  {% include "partials/breadcrumb-jsonld.html" %}
-#}

{%- set breadcrumb_enabled = (config.structured_data ?? {}).breadcrumb ?? true %}
{%- set _crumbs = get_breadcrumbs(page) %}
{%- if breadcrumb_enabled and (_crumbs | length) > 1 %}
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "BreadcrumbList",
  "itemListElement": [
    {%- for item in _crumbs %}
    {
      "@type": "ListItem",
      "position": {{ loop.index }},
      "name": {{ (item.title ?? '') | tojson }},
      "item": {{ ((item.href ?? '/') | absolute_url) | tojson }}
    }{{ "," if not loop.last else "" }}
    {%- end %}
  ]
}
</script>
{% end %}