added timestamp to bloc cache, showing age in offline mode

lib/state/app/infrastructure/utilityWidgets/loadableHydratedBloc/loadable_save_context.dart

@@ -0,0 +1,24 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'loadable_save_context.freezed.dart';
+part 'loadable_save_context.g.dart';
+
+@freezed
+class LoadableSaveContext with _$LoadableSaveContext {
+  const LoadableSaveContext._();
+  const factory LoadableSaveContext({
+    required int timestamp,
+  }) = _LoadableSaveContext;
+
+  factory LoadableSaveContext.fromJson(Map<String, dynamic> json) => _$LoadableSaveContextFromJson(json);
+
+  static String dataKey = 'data';
+  static String metaKey = 'meta';
+
+  static Map<String, dynamic> wrap(Map<String, dynamic>? data, int lastFetch) =>
+      {dataKey: data, metaKey: LoadableSaveContext(timestamp: lastFetch).toJson()};
+
+  static ({Map<String, dynamic> data, LoadableSaveContext meta}) unwrap(Map<String, dynamic> data) =>
+      (data: data[dataKey] as Map<String, dynamic>, meta: LoadableSaveContext.fromJson(data[metaKey]));
+}
+