fix(helpdesk): replace description column with category in team ticket table

Description is not available on PBI_LV_Tickets. Show Category_1_Code
as its own 'Category' column instead of misusing it as description.
Remove unused ticket-desc CSS class.

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

modules/helpdesk/web/css/helpdesk.css

@@ -219,15 +219,6 @@
     color: var(--app-muted-color);
   }
 
-  /* Description: takes remaining space, ellipsis on overflow */
-  .helpdesk-team-ticket-desc {
-    width: 100%;
-    max-width: 0;
-    overflow: hidden;
-    text-overflow: ellipsis;
-    white-space: nowrap;
-  }
-
   /* Links */
   .helpdesk-team-ticket-no a,
   .helpdesk-team-ticket-table td a {