fix(helpdesk): remove 'Ticket communication' section title entirely

Remove the heading and the CSS override — communication feed starts
directly without a title in the ticket detail view.

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

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

@@ -46,7 +46,6 @@ $backUrl = $ticketCustomerNo !== '' ? lurl('helpdesk/debitor/' . rawurlencode($t
       <!-- Communication feed — main content, loaded async -->
       <div class="helpdesk-ticket-detail-content">
         <section>
-          <h3 class="helpdesk-support-section-title"><?php e(t('Ticket communication')); ?></h3>
           <div id="ticket-communication-loading">
             <?php for ($i = 0; $i < 6; $i++): ?>
               <div class="helpdesk-skeleton helpdesk-skeleton-aside-bubble <?php e($i % 2 === 1 ? 'helpdesk-skeleton-aside-bubble-alt' : ($i % 3 === 0 ? 'helpdesk-skeleton-aside-bubble-short' : '')); ?>"></div>

modules/helpdesk/web/css/helpdesk.css

@@ -1312,9 +1312,6 @@
     max-height: none;
   }
 
-  .helpdesk-ticket-detail-content .helpdesk-support-section-title::after {
-    display: none;
-  }
 
   /* --- Controlling dashboard --- */