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/CustomFieldsView.php

@@ -48,7 +48,7 @@ include __DIR__ . '/../../views/layout_header.php';
               <td data-label="Order" class="lt-text-xs lt-text-muted"><?= (int)$field['display_order'] ?></td>
               <td data-label="Field Name"><code class="lt-text-cyan lt-text-xs"><?= htmlspecialchars($field['field_name']) ?></code></td>
               <td data-label="Label"><strong><?= htmlspecialchars($field['field_label']) ?></strong></td>
-              <td data-label="Type" class="lt-text-xs"><?= ucfirst($field['field_type']) ?></td>
+              <td data-label="Type" class="lt-text-xs"><?= htmlspecialchars(ucfirst($field['field_type'])) ?></td>
               <td data-label="Category" class="lt-text-xs"><?= htmlspecialchars($field['category'] ?? 'All') ?></td>
               <td data-label="Required" class="lt-text-center">
                 <?= $field['is_required'] ? '<span class="lt-text-amber">✓</span>' : '<span class="lt-text-muted">—</span>' ?>
@@ -61,9 +61,9 @@ 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-field" data-id="<?= $field['field_id'] ?>">EDIT</button>
+                          data-action="edit-field" data-id="<?= (int)$field['field_id'] ?>">EDIT</button>
                   <button type="button" class="lt-btn lt-btn-sm lt-btn-danger"
-                          data-action="delete-field" data-id="<?= $field['field_id'] ?>">DEL</button>
+                          data-action="delete-field" data-id="<?= (int)$field['field_id'] ?>">DEL</button>
                 </div>
               </td>
             </tr>