feat: adjust the max age check for dob with refine method

Author: david-roper

apps/web/src/components/StartSessionForm/StartSessionForm.tsx

@@ -15,9 +15,9 @@ import { z } from 'zod/v4';
 
 const currentDate = new Date();
 
-const EIGHTEEN_YEARS = 568025136000; // milliseconds
+// const EIGHTEEN_YEARS = 568025136000; // milliseconds
 
-const MIN_DATE_OF_BIRTH = new Date(currentDate.getTime() - EIGHTEEN_YEARS);
+//const MIN_DATE_OF_BIRTH = new Date(currentDate.getTime() - EIGHTEEN_YEARS);
 
 type StartSessionFormData = {
   sessionDate: Date;
@@ -46,6 +46,13 @@ export const StartSessionForm = ({
   onSubmit
 }: StartSessionFormProps) => {
   const { resolvedLanguage, t } = useTranslation();
+  const MIN_DATE_OF_BIRTH = currentGroup?.settings.minimumAgeApplied
+    ? new Date(
+        currentDate.getTime() -
+          (currentGroup?.settings.minimumAge ? currentGroup?.settings.minimumAge * 31556952000 : 0)
+      )
+    : undefined;
+
   return (
     <Form
       preventResetValuesOnReset
@@ -177,8 +184,26 @@ export const StartSessionForm = ({
             .optional(),
           subjectDateOfBirth: z
             .date()
-            .max(MIN_DATE_OF_BIRTH, { message: t('session.errors.mustBeAdult') })
-            .optional(),
+
+            // .max(MIN_DATE_OF_BIRTH, { message: t({
+            //   en: `Subject must be above age of ${currentGroup?.settings.minimumAge}`,
+            //   fr: `Le sujet doit être âgé de plus de ${currentGroup?.settings.minimumAge}`
+            // }) })
+            .optional()
+            .refine(
+              (date) => {
+                // If there's no date picked or no limit defined, it's valid
+                if (!date || !MIN_DATE_OF_BIRTH) return true;
+                // Otherwise, ensure the date is not after the maximum allowed date
+                return date <= MIN_DATE_OF_BIRTH;
+              },
+              {
+                message: t({
+                  en: `Subject must be above age of ${currentGroup?.settings.minimumAge}`,
+                  fr: `Le sujet doit être âgé de plus de ${currentGroup?.settings.minimumAge}`
+                })
+              }
+            ),
           subjectSex: z.enum(['MALE', 'FEMALE']).optional(),
           sessionType: $SessionType.exclude(['REMOTE']),
           sessionDate: z