feat(features): add subscription sharing

packages/features/src/Domain/Feature/FeatureIdentifier.ts

@@ -17,6 +17,7 @@ export enum FeatureIdentifier {
   SmartFilters = 'org.standardnotes.smart-filters',
   TagNesting = 'org.standardnotes.tag-nesting',
   TwoFactorAuth = 'org.standardnotes.two-factor-auth',
+  SubscriptionSharing = 'org.standardnotes.subscription-sharing',
 
   AutobiographyTheme = 'org.standardnotes.theme-autobiography',
   DynamicTheme = 'org.standardnotes.theme-dynamic',

packages/features/src/Domain/Lists/ServerFeatures.ts

@@ -60,5 +60,10 @@ export function serverFeatures(): ServerFeatureDescription[] {
       identifier: FeatureIdentifier.FilesLowStorageTier,
       permission_name: PermissionName.FilesLowStorageTier,
     },
+    {
+      availableInSubscriptions: [SubscriptionName.ProPlan],
+      identifier: FeatureIdentifier.SubscriptionSharing,
+      permission_name: PermissionName.SubscriptionSharing,
+    },
   ]
 }

packages/features/src/Domain/Permission/PermissionName.ts

@@ -39,4 +39,5 @@ export enum PermissionName {
   TitaniumTheme = 'theme:titanium',
   TokenVaultEditor = 'editor:token-vault',
   TwoFactorAuth = 'server:two-factor-auth',
+  SubscriptionSharing = 'server:subscription-sharing',
 }