梁建民 / scm_app

- Add email suggestions dropdown component with styling for autocomplete functionality
- Implement email input handler to detect user input and generate domain suggestions
- Add focus/blur event handlers to show/hide suggestions dropdown with 200ms delay
- Create suggestion item selection handler to populate email field with selected suggestion
- Add email domains configuration array for extensible domain support
- Style suggestions dropdown with shadow, border, hover effects, and scrollable container
- Hide suggestions when user includes @ symbol in input to avoid duplicate domains