LibWeb: Saturate PixelUnits on creation when needed

Author: https://github.com/Hendiadyoin1
Commit: 1e5ba09d76
Pull-request: https://github.com/SerenityOS/serenity/pull/20210
Reviewed-by: https://github.com/kalenikaliaksandr ✅

Userland/Libraries/LibWeb/PixelUnits.h

@@ -57,6 +57,9 @@ public:
 
     static constexpr i32 radix_mask = fixed_point_denominator - 1;
 
+    static constexpr i32 max_integer_value = NumericLimits<int>::max() >> fractional_bits;
+    static constexpr i32 min_integer_value = NumericLimits<int>::min() >> fractional_bits;
+
     CSSPixels() = default;
     CSSPixels(int value);
     CSSPixels(unsigned int value);