Admin: stats privacy toggle, clickable event rows, fix payment method display

- Add useStatsPrivacy hook with localStorage persistence for stats visibility
- Single event page: desktop privacy button, hide capacity chip when stats hidden
- Events list: row/card click navigates to event detail; stopPropagation on actions
- Backend GET /tickets: include payment for each ticket (removes N+1)
- Bookings page: use list payment data, show — when payment method unknown

Made-with: Cursor

frontend/src/app/admin/bookings/page.tsx

@@ -59,19 +59,13 @@ export default function AdminBookingsPage() {
         ticketsApi.getAll(),
         eventsApi.getAll(),
       ]);
-      
-      const ticketsWithDetails = await Promise.all(
-        ticketsRes.tickets.map(async (ticket) => {
-          try {
-            const { ticket: fullTicket } = await ticketsApi.getById(ticket.id);
-            return fullTicket;
-          } catch {
-            return ticket;
-          }
-        })
-      );
-      
-      setTickets(ticketsWithDetails);
+
+      const ticketsWithEvent = ticketsRes.tickets.map((ticket) => ({
+        ...ticket,
+        event: eventsRes.events.find((e) => e.id === ticket.eventId),
+      }));
+
+      setTickets(ticketsWithEvent);
       setEvents(eventsRes.events);
     } catch (error) {
       toast.error('Failed to load bookings');
@@ -153,7 +147,8 @@ export default function AdminBookingsPage() {
     }
   };
 
-  const getPaymentMethodLabel = (provider: string) => {
+  const getPaymentMethodLabel = (provider: string | null) => {
+    if (provider == null) return '—';
     const labels: Record<string, string> = {
       cash: locale === 'es' ? 'Efectivo en el Evento' : 'Cash at Event',
       bank_transfer: locale === 'es' ? 'Transferencia Bancaria' : 'Bank Transfer',
@@ -164,13 +159,13 @@ export default function AdminBookingsPage() {
     return labels[provider] || provider;
   };
 
-  const getDisplayProvider = (ticket: TicketWithDetails) => {
+  const getDisplayProvider = (ticket: TicketWithDetails): string | null => {
     if (ticket.payment?.provider) return ticket.payment.provider;
     if (ticket.bookingId) {
-      const sibling = tickets.find(t => t.bookingId === ticket.bookingId && t.payment?.provider);
-      return sibling?.payment?.provider ?? 'cash';
+      const sibling = tickets.find((t) => t.bookingId === ticket.bookingId && t.payment?.provider);
+      return sibling?.payment?.provider ?? null;
     }
-    return 'cash';
+    return null;
   };
 
   const filteredTickets = tickets.filter((ticket) => {