The subtitle was built by ~-concatenating a Markup operand
(user.email | e) with HTML string literals. Under autoescaping,
Jinja2's markup_join escapes every non-Markup part once it hits a
Markup operand — so the literal <strong> tags became <strong>
and the page showed literal "<strong>...</strong>" text around the
email. The | safe in _page_hero.html was too late to undo it.
Switch to {% set %}...{% endset %} block capture: the literal
<strong> stays HTML while {{ user.email }} is still autoescaped.
Regression test asserts the tags render and a hostile email stays
escaped.
8b5b0f8ef5