Migrate coupon redemption prompt dialog

apps/client/src/app/components/user-account-membership/user-account-membership.component.ts

@@ -163,8 +163,9 @@ export class UserAccountMembershipComponent implements OnDestroy {
   }
 
   public onRedeemCoupon() {
-    let couponCode = prompt($localize`Please enter your coupon code:`);
-    couponCode = couponCode?.trim();
+    this.notificationService.prompt({
+      confirmFn: (value) => {
+        const couponCode = value?.trim();
 
         if (couponCode) {
           this.dataService
@@ -207,6 +208,9 @@ export class UserAccountMembershipComponent implements OnDestroy {
                 });
             });
         }
+      },
+      title: $localize`Please enter your coupon code.`
+    });
   }
 
   public ngOnDestroy() {