Force UI update before generating ticket PDF

Added a zero-delay timeout to ensure the UI is updated before calling the PDF generation service. This helps prevent potential UI rendering issues when generating tickets.

src/app/purchase-success/purchase-success.component.ts

@@ -45,6 +45,9 @@ export class PurchaseSuccessComponent {
       verticalPosition: 'top'
     });
 
+    // UI-Aktuallisierung erzwingen
+    await new Promise(resolve => setTimeout(resolve, 0));
+
     try {
       await this.pdfService.genTicket(this.tickets(), PdfTicketComponent)
       this.loadingService.hide();