v2.2.8

feat: enhance workflow management with versioning and improved UI

- Added functionality to save and retrieve workflow versions in the REST API.
- Updated the `ai_gateway_rest_get_workflow` and `ai_gateway_rest_update_workflow` functions to handle workflow versions.
- Introduced a new UI for managing workflow nodes, including drag-and-drop functionality.
- Implemented local storage for workspace mode and width settings.
- Enhanced the workflow builder with version notes and restore options for previous versions.
- Improved user experience with a new tabbed interface for workspace modes.