Update various improvements and minor changes

src/hooks/useAppState.ts

@@ -54,6 +54,54 @@ export const useAppState = () => {
           }
         }
 
+        // Validate numeric fields and replace empty/invalid values with defaults
+        const validateNumericField = (value: any, defaultValue: any): any => {
+          if (value === '' || value === null || value === undefined || isNaN(Number(value))) {
+            return defaultValue;
+          }
+          return value;
+        };
+
+        // Validate basic pkParams
+        if (migratedPkParams.basic) {
+          migratedPkParams.basic.eliminationHalfLife = validateNumericField(
+            migratedPkParams.basic.eliminationHalfLife,
+            defaults.pkParams.basic.eliminationHalfLife
+          );
+          migratedPkParams.basic.bodyWeight = validateNumericField(
+            migratedPkParams.basic.bodyWeight,
+            defaults.pkParams.basic.bodyWeight
+          );
+        }
+
+        // Validate advanced pkParams
+        if (migratedPkParams.advanced) {
+          migratedPkParams.advanced.conversionEfficiency = validateNumericField(
+            migratedPkParams.advanced.conversionEfficiency,
+            defaults.pkParams.advanced.conversionEfficiency
+          );
+          migratedPkParams.advanced.bioavailability = validateNumericField(
+            migratedPkParams.advanced.bioavailability,
+            defaults.pkParams.advanced.bioavailability
+          );
+          migratedPkParams.advanced.customVolumeOfDistribution = validateNumericField(
+            migratedPkParams.advanced.customVolumeOfDistribution,
+            defaults.pkParams.advanced.customVolumeOfDistribution
+          );
+          migratedPkParams.advanced.absorptionDelay = validateNumericField(
+            migratedPkParams.advanced.absorptionDelay,
+            defaults.pkParams.advanced.absorptionDelay
+          );
+          migratedPkParams.advanced.absorptionRateConstant = validateNumericField(
+            migratedPkParams.advanced.absorptionRateConstant,
+            defaults.pkParams.advanced.absorptionRateConstant
+          );
+          migratedPkParams.advanced.mealDelayFactor = validateNumericField(
+            migratedPkParams.advanced.mealDelayFactor,
+            defaults.pkParams.advanced.mealDelayFactor
+          );
+        }
+
         setAppState({
           ...defaults,
           ...parsedState,