- Consolidate unit of work implementation with NotificationUnitOfWork.
- Refactor repositories to use NotificationBaseRepository for consistency.
- Simplify request handlers by removing IUnitOfWork dependency.
- Update related tests and service registration.
- Introduce preview panel to edit form for rendering subject, HTML, and text with sample values.
- Add support for real-time updates using JavaScript.
- Include supporting styles for preview panel in admin CSS.
- Add optional `Scripts` section rendering to `_EditorLayout`.
- Create `.env.Development` for better development environment configuration.