Add tag overview, improve assets

CHDataManagement/Model/Item/Item.swift

@@ -0,0 +1,55 @@
+import Foundation
+
+class Item: ObservableObject, Identifiable {
+
+    unowned let content: Content
+
+    @Published
+    var id: String
+
+    init(content: Content, id: String) {
+        self.content = content
+        self.id = id
+    }
+
+    func makeCleanAbsolutePath(_ path: String) -> String {
+        "/" + makeCleanRelativePath(path)
+    }
+
+    func makeCleanRelativePath(_ path: String) -> String {
+        path.components(separatedBy: "/").filter { !$0.isEmpty }.joined(separator: "/")
+    }
+
+    func title(in language: ContentLanguage) -> String {
+        fatalError()
+    }
+
+    func absoluteUrl(in language: ContentLanguage) -> String {
+        fatalError()
+    }
+
+    var itemType: ItemType {
+        fatalError()
+    }
+}
+
+extension Item: Equatable {
+
+    static func == (lhs: Item, rhs: Item) -> Bool {
+        lhs.id == rhs.id
+    }
+}
+
+extension Item: Hashable {
+
+    func hash(into hasher: inout Hasher) {
+        hasher.combine(id)
+    }
+}
+
+extension Item: Comparable {
+
+    static func < (lhs: Item, rhs: Item) -> Bool {
+        lhs.id < rhs.id
+    }
+}