Save automatically, improve mocks

CHDataManagement/Main/StorageErrorView.swift

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+import SwiftUI
+
+struct StorageErrorView: View {
+
+    @EnvironmentObject
+    private var content: Content
+
+    @Binding
+    var isPresented: Bool
+
+    var body: some View {
+        VStack {
+            Text("Failed to load database")
+                .font(.headline)
+            List(content.storageErrors) { error in
+                VStack {
+                    Text(error.message)
+                    Text(error.date.formatted())
+                        .font(.footnote)
+                }
+            }
+            .frame(minHeight: 300)
+            Button("Dismiss", action: { isPresented = false })
+                .padding()
+        }
+        .padding()
+    }
+}