{% comment %}
Base email layout — shared shell (header/logo, body slot, footer) for every
stapel-notifications email. Branding is driven by STAPEL_NOTIFICATIONS:
LOGO_URL, BRAND_PRIMARY, BRAND_PRIMARY_DARK, BRAND_BG, BRAND_TEXT — threaded
in as logo_url / brand_* template variables by services.process_notification.
Type templates extend this and fill {% block content %}; override
{% block preheader %} (defaults to the subject) or {% block footer %} when
needed. The footer picks the unsubscribe variant automatically whenever an
unsubscribe_url is present (non-auth groups).
{% endcomment %}
{{ subject }}
{% block head_extra %}{% endblock %}