feat(helpdesk): add refresh button to ticket detail titlebar

Adds 'Refresh data' button that re-fetches the communication feed
with ?refresh=1 to bypass the session cache. Shows loading skeleton
during reload.

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

modules/helpdesk/pages/helpdesk/ticket(default).phtml

@@ -31,7 +31,14 @@ $backUrl = $ticketCustomerNo !== '' ? lurl('helpdesk/debitor/' . rawurlencode($t
         'title' => t('Ticket') . ' ' . $ticketNo,
         'backHref' => $backUrl,
         'backTitle' => t('Back'),
-        'actions' => [],
+        'actions' => $ticket !== null ? [
+            [
+                'label' => t('Refresh data'),
+                'type' => 'button',
+                'name' => 'ticket-refresh',
+                'class' => 'secondary outline',
+            ],
+        ] : [],
     ];
     require templatePath('partials/app-details-titlebar.phtml');
     ?>