fix: use consistent text-body-1 text-disabled for timestamps

Replace custom text-caption span with the standard
<p class="text-body-1 text-disabled mb-0"> pattern used across
all other pages in the codebase.

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

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

@@ -234,10 +234,10 @@ function confirmRevokeInvitation() {
               {{ organisation.billing_status.charAt(0).toUpperCase() + organisation.billing_status.slice(1) }}
             </VChip>
           </div>
-          <span class="text-caption text-disabled">
+          <p class="text-body-1 text-disabled mb-0">
             Aangemaakt op {{ formatDate(organisation.created_at) }}
             &middot; Gewijzigd op {{ formatDate(organisation.updated_at) }}
-          </span>
+          </p>
         </div>
         <VBtn
           v-if="isOrgAdmin"

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

@@ -252,10 +252,10 @@ function formatDate(iso: string): string {
                 {{ org.billing_status_label ?? org.billing_status }}
               </VChip>
             </div>
-            <span class="text-caption text-disabled">
+            <p class="text-body-1 text-disabled mb-0">
               Aangemaakt op {{ formatDate(org.created_at) }}
               &middot; Gewijzigd op {{ formatDate(org.updated_at) }}
-            </span>
+            </p>
           </div>
         </div>
         <div class="d-flex gap-x-2">