- Integrated `UsersService` into `MessagesService` for retrieving user preferences.
- Updated `markAsRead` functionality to respect `showReadReceipts` preference.
- Enhanced real-time read receipt notifications via `EventsGateway`.
- Added `markAsRead` method to the frontend message service.
- Added `markAsRead` and `countUnreadMessages` mocks to `MessagesService` tests.
- Included enriched comment retrieval and WebSocket notification validation in `CommentsService` tests.
- Updated dependency injection to include `EventsGateway` in `CommentsService` tests.
- Renamed `repository` and `eventsGateway` to `_repository` and `_eventsGateway` to follow conventions for unused test variables.
- Reformatted multiline assertions for better readability.
- Added comprehensive unit tests for `MessagesService`, `CommentsService`, `EventsGateway`, and enhancements in `UsersService`.
- Ensured proper mocking and test coverage for newly introduced dependencies like `EventsGateway` and `RBACService`.
