fix: allow plus plan to restore flames

lib/src/services/subscription.service.dart

@@ -10,8 +10,20 @@ enum SubscriptionPlan {
   Plus,
 }
 
-bool isAdditionalAccount(SubscriptionPlan plan) {
-  return plan == SubscriptionPlan.Free || plan == SubscriptionPlan.Plus;
+enum PremiumFeatures { RestoreFlames }
+
+const Map<PremiumFeatures, List<SubscriptionPlan>> planPermissions = {
+  PremiumFeatures.RestoreFlames: [
+    SubscriptionPlan.Family,
+    SubscriptionPlan.Plus,
+    SubscriptionPlan.Tester,
+    SubscriptionPlan.Pro,
+  ],
+};
+
+bool isUserAllowed(SubscriptionPlan plan, PremiumFeatures feature) {
+  final allowedPlans = planPermissions[feature] ?? [];
+  return allowedPlans.contains(plan);
 }
 
 bool isPayingUser(SubscriptionPlan plan) {

lib/src/views/components/max_flame_list_title.dart

@@ -46,7 +46,7 @@ class _MaxFlameListTitleState extends State<MaxFlameListTitle> {
   }
 
   Future<void> _restoreFlames() async {
-    if (!isPayingUser(getCurrentPlan())) {
+    if (!isUserAllowed(getCurrentPlan(), PremiumFeatures.RestoreFlames)) {
       await context.push(Routes.settingsSubscription);
       return;
     }

test/features/premium_features.dart

@@ -0,0 +1,17 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:twonly/src/services/subscription.service.dart';
+
+void main() {
+  group('testing subscription permissions', () {
+    test('test if restore flames is allowed', () {
+      expect(
+        true,
+        isUserAllowed(SubscriptionPlan.Plus, PremiumFeatures.RestoreFlames),
+      );
+      expect(
+        false,
+        isUserAllowed(SubscriptionPlan.Free, PremiumFeatures.RestoreFlames),
+      );
+    });
+  });
+}