greenBox method
Wraps the widget in a ColoredBox with system green color.
Uses CupertinoColors.systemGreen which adapts to light/dark mode. This is the standard green color used throughout iOS interfaces, commonly used for success states or positive actions.
Returns a ColoredBox containing the current widget with green background.
Example:
Icon(CupertinoIcons.checkmark).greenBox()
Implementation
ColoredBox greenBox() => coloredBox(CupertinoColors.systemGreen);