Fix unsigned integers may overflow in RangeWidget

Updated the decrement logic to prevent overflow by checking if the current value is less than the minimum plus step before performing the subtraction. This ensures safer calculations and maintains expected behavior during decrements.

Fixes #306

src/widget/WidgetRange.h

@@ -85,7 +85,7 @@ class WidgetRange : public BaseWidgetValue<T> {
      * @return true if decremented or reset (in case of cycle)
      */
     bool decrement() {
-        T newValue = (this->value - step < minValue) ? (cycle ? maxValue : minValue) : (this->value - step);
+        T newValue = (this->value < minValue + step) ? (cycle ? maxValue : minValue) : (this->value - step);
         if (newValue != this->value) {
             this->value = newValue;
             LOG(F("WidgetRange::decrement"), this->value);