TODO

Fix broken flash-messages.php include in admin footer
Make .repertoire-col columns scrollable instead of .search-main
Replace JS toast system with pure HTMX toast fragment (top-right, CSS-only auto-fade)
Separate admin views from controllers: move all HTML to templates/admin/*.php, fragments to templates/admin/partials/
Add SMTP test email button in parametres.php (action + CSS)
Fix SmtpRelay::send() — replace broken mail() stub with native PHP socket SMTP client (STARTTLS/SSL, AUTH PLAIN/LOGIN)
Lock body scroll on all pages (admin + public); only main or inner element scrolls