fix functional bugs

lib/presentation/state/susbcription_details_state.dart

@@ -15,21 +15,29 @@ class DetailsContentState extends SubscriptionDetailsState {
   final Subscription subscription;
   final SubscriptionPeriod selectedPeriod;
   final bool isAgreed;
+  final bool isAlreadyPurchased; // ✅ Куплена ли эта подписка сейчас
+  final bool isSuccess;          // ✅ Сигнал для навигатора назад
 
   DetailsContentState({
     required this.subscription,
     required this.selectedPeriod,
     this.isAgreed = false,
+    this.isAlreadyPurchased = false,
+    this.isSuccess = false,
   });
 
   DetailsContentState copyWith({
     SubscriptionPeriod? selectedPeriod,
     bool? isAgreed,
+    bool? isAlreadyPurchased,
+    bool? isSuccess,
   }) {
     return DetailsContentState(
       subscription: this.subscription,
       selectedPeriod: selectedPeriod ?? this.selectedPeriod,
       isAgreed: isAgreed ?? this.isAgreed,
+      isAlreadyPurchased: isAlreadyPurchased ?? this.isAlreadyPurchased,
+      isSuccess: isSuccess ?? this.isSuccess,
     );
   }
 }