Update settings add min<=max validation to ranges, minor text changes

src/constants/defaults.ts

@@ -159,7 +159,7 @@ export const getDefaultState = (): AppState => ({
     }
   ],
   steadyStateConfig: { daysOnMedication: '7' }, // kept for backwards compatibility, now sourced from pkParams.advanced
-  therapeuticRange: { min: '', max: '' }, // Empty by default - users should personalize based on their response
+  therapeuticRange: { min: '10', max: '120' }, // min for adults and max for children for maximum range (users should personalize based on their response)
   doseIncrement: '2.5',
   uiSettings: {
     showDayTimeOnXAxis: '24h',
@@ -168,7 +168,7 @@ export const getDefaultState = (): AppState => ({
     yAxisMin: '',
     yAxisMax: '',
     simulationDays: '5',
-    displayedDays: '2',
+    displayedDays: '1',
     showTherapeuticRange: false,
     steadyStateDaysEnabled: true,
     stickyChart: false,