Fix watcher self-notification, unescaped output in views

- NotificationHelper::notifyWatchers: excludeUserId parameter was
  accepted but never used; actors were notified of their own actions.
  Fix: add AND tw.user_id != ? clause to watcher query when exclusion
  is requested.

- TicketView.php: formatAction() default case returned raw
  $event['action_type'] unescaped into HTML context. Fix: wrap with
  htmlspecialchars().

- Admin views: field_id, recurring_id, template_id, transition_id
  in data-id attributes were uncast; field_type was unescaped in
  CustomFieldsView; from/to_status slugs derived from DB values were
  used directly in class attributes in WorkflowDesignerView.
  Fix: (int) cast for IDs, htmlspecialchars for field_type,
  preg_replace to sanitize DB-derived CSS class slugs.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

views/admin/TemplatesView.php

@@ -56,9 +56,9 @@ include __DIR__ . '/../../views/layout_header.php';
               <td data-label="Actions">
                 <div class="lt-btn-group">
                   <button type="button" class="lt-btn lt-btn-sm"
-                          data-action="edit-template" data-id="<?= $tpl['template_id'] ?>">EDIT</button>
+                          data-action="edit-template" data-id="<?= (int)$tpl['template_id'] ?>">EDIT</button>
                   <button type="button" class="lt-btn lt-btn-sm lt-btn-danger"
-                          data-action="delete-template" data-id="<?= $tpl['template_id'] ?>">DEL</button>
+                          data-action="delete-template" data-id="<?= (int)$tpl['template_id'] ?>">DEL</button>
                 </div>
               </td>
             </tr>