{# _templates/layout.html #}
{% extends "!layout.html" %} {# Extends the theme's default layout.html #}

{% block extrahead %}
  {{ super() }} {# This calls the original extrahead block content from the theme's layout.html #}

  {# Your Umami script #}
  {% if umami_script_src and umami_website_id %}
    <script defer src="{{ umami_script_src }}" data-website-id="{{ umami_website_id }}"></script>
  {% endif %}
{% endblock %}

{# All other sections of the upstream layout.html are kept as is. #}