feat: add date_of_birth field to persons across all layers

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/app/src/components/persons/PersonDetailPanel.vue

@@ -37,10 +37,20 @@ const dateFormatter = new Intl.DateTimeFormat('nl-NL', {
   year: 'numeric',
 })
 
+const dobFormatter = new Intl.DateTimeFormat('nl-NL', {
+  day: 'numeric',
+  month: 'long',
+  year: 'numeric',
+})
+
 function formatDate(iso: string) {
   return dateFormatter.format(new Date(iso))
 }
 
+function formatDateOfBirth(dateStr: string) {
+  return dobFormatter.format(new Date(`${dateStr}T00:00:00`))
+}
+
 function getInitials(name: string) {
   return name
     .split(' ')
@@ -175,6 +185,17 @@ function onBlacklistToggle(val: boolean | null) {
         <!-- Tab: Informatie -->
         <VTabsWindowItem value="info">
           <VList class="pa-0">
+            <VListItem>
+              <template #prepend>
+                <VIcon
+                  icon="tabler-cake"
+                  class="me-3"
+                />
+              </template>
+              <VListItemTitle>Geboortedatum</VListItemTitle>
+              <VListItemSubtitle>{{ person.date_of_birth ? formatDateOfBirth(person.date_of_birth) : 'Niet opgegeven' }}</VListItemSubtitle>
+            </VListItem>
+
             <VListItem>
               <template #prepend>
                 <VIcon