Update input field error/warning behavior and time picker handling

src/components/day-schedule.tsx

@@ -93,6 +93,9 @@ const DaySchedule: React.FC<DayScheduleProps> = ({
               const duplicateTimeCount = day.doses.filter(d => d.time === dose.time).length;
               const hasDuplicateTime = duplicateTimeCount > 1;
 
+              // Check for zero dose
+              const isZeroDose = dose.ldx === '0' || dose.ldx === '0.0';
+
               return (
                 <div key={dose.id} className="grid grid-cols-[120px_1fr_auto] gap-3 items-center">
                   <FormTimeInput
@@ -110,7 +113,9 @@ const DaySchedule: React.FC<DayScheduleProps> = ({
                     min={0}
                     unit="mg"
                     required={true}
+                    warning={isZeroDose}
                     errorMessage={t('errorNumberRequired')}
+                    warningMessage={t('warningZeroDose')}
                   />
                   <Button
                     onClick={() => onRemoveDose(day.id, dose.id)}