adding date to txt export

web/src/routes/(admin)/admin/tournament/[slug]/registrations/+page.svelte

@@ -312,6 +312,7 @@
 		} else {
 			for (const registration of registrations) {
 				lines.push(registrationHeading(registration));
+				lines.push(`Skapad: ${formatDateTime(registration.created_at) ?? registration.created_at}`);
 				for (const field of entryFields()) {
 					const value = fieldValue(registration.entry, field).trim();
 					lines.push(`${field.label}: ${value || '—'}`);