Fix various issues with pharmacokinetics, improved parameters, distinction between adult/child

src/hooks/useAppState.ts

@@ -199,6 +199,25 @@ export const useAppState = () => {
     }));
   };
 
+  // More flexible update function for non-string fields (e.g., isFed boolean)
+  const updateDoseFieldInDay = (dayId: string, doseId: string, field: string, value: any) => {
+    setAppState(prev => ({
+      ...prev,
+      days: prev.days.map(day => {
+        if (day.id !== dayId) return day;
+
+        const updatedDoses = day.doses.map(dose =>
+          dose.id === doseId ? { ...dose, [field]: value } : dose
+        );
+
+        return {
+          ...day,
+          doses: updatedDoses
+        };
+      })
+    }));
+  };
+
   const sortDosesInDay = (dayId: string) => {
     setAppState(prev => ({
       ...prev,
@@ -238,6 +257,7 @@ export const useAppState = () => {
     addDoseToDay,
     removeDoseFromDay,
     updateDoseInDay,
+    updateDoseFieldInDay,
     sortDosesInDay,
     handleReset
   };