Add ticket system with QR scanner and PDF generation

- Add ticket validation and check-in API endpoints
- Add PDF ticket generation with QR codes (pdfkit)
- Add admin QR scanner page with camera support
- Add admin site settings page
- Update email templates with PDF ticket download link
- Add checked_in_by_admin_id field for audit tracking
- Update booking success page with ticket download
- Various UI improvements to events and booking pages

frontend/src/app/(public)/components/NextEventSection.tsx

@@ -62,10 +62,10 @@ export default function NextEventSection() {
             <h3 className="text-2xl font-bold text-primary-dark">
               {locale === 'es' && nextEvent.titleEs ? nextEvent.titleEs : nextEvent.title}
             </h3>
-            <p className="mt-3 text-gray-600">
-              {locale === 'es' && nextEvent.descriptionEs 
-                ? nextEvent.descriptionEs 
-                : nextEvent.description}
+            <p className="mt-3 text-gray-600 whitespace-pre-line">
+              {locale === 'es' 
+                ? (nextEvent.shortDescriptionEs || nextEvent.descriptionEs || nextEvent.shortDescription || nextEvent.description)
+                : (nextEvent.shortDescription || nextEvent.description)}
             </p>
             
             <div className="mt-6 space-y-3">
@@ -93,9 +93,11 @@ export default function NextEventSection() {
                   ? t('events.details.free')
                   : `${nextEvent.price.toLocaleString()} ${nextEvent.currency}`}
               </span>
-              <p className="text-sm text-gray-500 mt-1">
-                {nextEvent.availableSeats} {t('events.details.spotsLeft')}
-              </p>
+              {!nextEvent.externalBookingEnabled && (
+                <p className="text-sm text-gray-500 mt-1">
+                  {nextEvent.availableSeats} {t('events.details.spotsLeft')}
+                </p>
+              )}
             </div>
             <Button size="lg" className="mt-6">
               {t('common.moreInfo')}