isLight method
Determines whether the given color is "light".
A color is considered light if it is not dark.
Example:
Color lightColor = Color(0xFFFFF1F1);
print(lightColor.isLight()); // Output: true
Color darkColor = Color(0xFF1A1A1A);
print(darkColor.isLight()); // Output: false
Implementation
bool isLight() => !isDark();