Rework storage structs, link preview

CHDataManagement/Model/Settings/NavigationSettings.swift

@@ -1,6 +1,6 @@
 import Foundation
 
-final class NavigationSettings: ObservableObject {
+final class NavigationSettings: ObservableObject, LocalizedItem {
 
     /// The items to show in the navigation bar
     @Published
@@ -19,23 +19,31 @@ final class NavigationSettings: ObservableObject {
         self.german = german
         self.english = english
     }
-
-    init(file: NavigationSettingsFile, map: (String) -> Item?) {
-        self.navigationItems = file.navigationItems.compactMap(map)
-        self.german = LocalizedNavigationSettings(file: file.german)
-        self.english = LocalizedNavigationSettings(file: file.english)
-    }
-
-    var file: NavigationSettingsFile {
-        .init(
-            navigationItems: navigationItems.map { $0.itemType.id },
-            german: german.file,
-            english: english.file)
-    }
 }
 
-extension NavigationSettings: LocalizedItem {
-    
+// MARK: Storage
+
+extension NavigationSettings {
+
+    convenience init(context: LoadingContext, data: NavigationSettings.Data) {
+        self.init(
+            navigationItems: data.navigationItems.compactMap(context.item),
+            german: LocalizedNavigationSettings(data: data.german),
+            english: LocalizedNavigationSettings(data: data.english))
+    }
+
+    struct Data: Codable {
+        let navigationItems: [ItemId]
+        let german: LocalizedNavigationSettings.Data
+        let english: LocalizedNavigationSettings.Data
+    }
+
+    var data: Data {
+        .init(
+            navigationItems: navigationItems.map { $0.itemId },
+            german: german.data,
+            english: english.data)
+    }
 }
 
 extension NavigationSettings {