redBox method
Wraps the widget in a ColoredBox with system red color.
Uses CupertinoColors.systemRed which adapts to light/dark mode. This is the standard red color used throughout iOS interfaces.
Returns a ColoredBox containing the current widget with red background.
Example:
Icon(CupertinoIcons.heart).redBox()
Implementation
ColoredBox redBox() => coloredBox(CupertinoColors.systemRed);