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/lib/api.ts

@@ -179,6 +179,20 @@ export const ticketsApi = {
       method: 'POST',
       body: JSON.stringify(data),
     }),
+
+  guestCreate: (data: {
+    eventId: string;
+    firstName: string;
+    lastName?: string;
+    email?: string;
+    phone?: string;
+    preferredLanguage?: 'en' | 'es';
+    adminNote?: string;
+  }) =>
+    fetchApi<{ ticket: Ticket; payment: Payment; message: string }>('/api/tickets/admin/guest', {
+      method: 'POST',
+      body: JSON.stringify(data),
+    }),
   
   checkPaymentStatus: (ticketId: string) =>
     fetchApi<{ ticketStatus: string; paymentStatus: string; lnbitsStatus?: string; isPaid: boolean }>(
@@ -550,6 +564,7 @@ export interface Ticket {
   checkedInByAdminId?: string;
   qrCode: string;
   adminNote?: string;
+  isGuest?: boolean;
   createdAt: string;
   event?: Event;
   payment?: Payment;