confirmation_email.html.twig and reset_password/email.html.twig were
plain unstyled HTML with no shared structure. Extract a table-based
layout (templates/emails/layout.html.twig) with header/logo, content
block, and footer, so future transactional emails can extend it
instead of starting from scratch.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
