Mobile-friendly admin pages, redesigned homepage Next Event card

- Extract shared mobile components (BottomSheet, MoreMenu, Dropdown, etc.) into MobileComponents.tsx
- Make admin pages mobile-friendly: bookings, emails, events, faq, payments, tickets, users
- Redesign homepage Next Event card with banner image, responsive layout, and updated styling
- Fix past events showing on homepage/linktree: use proper Date comparison, auto-unfeature expired events
- Add "Over" tag to admin events list for past events
- Fix backend FRONTEND_URL for cache revalidation

Co-authored-by: Cursor <cursoragent@cursor.com>

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

@@ -17,7 +17,7 @@ export default function NextEventSectionWrapper({ initialEvent }: NextEventSecti
         <h2 className="section-title text-center">
           {t('home.nextEvent.title')}
         </h2>
-        <div className="mt-12 max-w-3xl mx-auto">
+        <div className="mt-12 max-w-4xl mx-auto">
           <NextEventSection initialEvent={initialEvent} />
         </div>
       </div>