{% comment %} Branded shell shared by every onboarding email. Mirrors the registration views (static/onboarding/onboarding.css): the "TAMIS · Audiovisual Metadata Space" lockup, Bricolage Grotesque display / Hanken Grotesk body, #16173F ink on the #F2F1FA page, #E116B4 accent, and the same white card (16px radius, #ECEBF3 border). Email-client constraints drive the markup: layout is table-based for Outlook, every rule is inlined because most clients strip