Booking flow: required terms and privacy checkbox with i18n

Also includes admin, dashboard, and API updates; PWA icon assets; and
assorted layout and utility changes on dev.

frontend/src/app/(public)/dashboard/components/ProfileTab.tsx

@@ -7,6 +7,7 @@ import Card from '@/components/ui/Card';
 import Button from '@/components/ui/Button';
 import Input from '@/components/ui/Input';
 import { dashboardApi, UserProfile } from '@/lib/api';
+import { parseDate } from '@/lib/utils';
 import toast from 'react-hot-toast';
 
 interface ProfileTabProps {
@@ -116,7 +117,7 @@ export default function ProfileTab({ onUpdate }: ProfileTabProps) {
             </span>
             <span className="font-medium">
               {profile?.memberSince
-                ? new Date(profile.memberSince).toLocaleDateString(
+                ? parseDate(profile.memberSince).toLocaleDateString(
                     language === 'es' ? 'es-ES' : 'en-US',
                     { year: 'numeric', month: 'long', day: 'numeric', timeZone: 'America/Asuncion' }
                   )