feat(shared): export utils module

- Added utils module
- Exported date formatter

Author: fulleni

lib/shared/shared.dart

@@ -7,3 +7,4 @@ library;
 export 'constants/constants.dart';
 export 'theme/theme.dart';
 export 'widgets/widgets.dart';
+export 'utils/utils.dart'; // Added export for utils

lib/shared/utils/utils.dart

@@ -0,0 +1,4 @@
+/// Barrel file for shared utility functions.
+library;
+
+export 'date_formatter.dart';