isMobile static method
Check if the device is a mobile device.
This method checks the width of the screen in the given BuildContext context
and returns true if the width is less than or equal to 500, indicating a mobile device.
Example:
bool isMobile = MyScreenUtils.isMobile(context);
Implementation
static bool isMobile(BuildContext context) {
return MediaQuery.sizeOf(context).width <= 500;
}