fix: unify date formatting and add missing updated_at timestamp

Both organisation pages now use the same date format:
"14 april 2026 om 01:11 uur". Added missing "Gewijzigd op" timestamp
to the organizer organisation page header.

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

apps/app/src/pages/organisation/index.vue

@@ -118,11 +118,10 @@ function getInitials(name: string): string {
 }
 
 function formatDate(iso: string) {
-  return new Date(iso).toLocaleDateString('nl-NL', {
-    year: 'numeric',
-    month: 'long',
-    day: 'numeric',
-  })
+  const d = new Date(iso)
+  const date = d.toLocaleDateString('nl-NL', { day: 'numeric', month: 'long', year: 'numeric' })
+  const time = d.toLocaleTimeString('nl-NL', { hour: '2-digit', minute: '2-digit' })
+  return `${date} om ${time} uur`
 }
 
 function openEditRole(member: Member) {
@@ -237,6 +236,7 @@ function confirmRevokeInvitation() {
           </div>
           <span class="text-caption text-medium-emphasis">
             Aangemaakt op {{ formatDate(organisation.created_at) }}
+            &middot; Gewijzigd op {{ formatDate(organisation.updated_at) }}
           </span>
         </div>
         <VBtn

apps/app/src/pages/platform/organisations/[id].vue

@@ -197,13 +197,10 @@ function showSnackbar(message: string, color: string) {
 }
 
 function formatDate(iso: string): string {
-  return new Date(iso).toLocaleDateString('nl-NL', {
-    day: '2-digit',
-    month: '2-digit',
-    year: 'numeric',
-    hour: '2-digit',
-    minute: '2-digit',
-  })
+  const d = new Date(iso)
+  const date = d.toLocaleDateString('nl-NL', { day: 'numeric', month: 'long', year: 'numeric' })
+  const time = d.toLocaleTimeString('nl-NL', { hour: '2-digit', minute: '2-digit' })
+  return `${date} om ${time} uur`
 }
 </script>