feat(helpdesk): enrich team ticket table with links, customer name, description, last activity

- Switch gateway from PBI_LV_Tickets to PBI_FP_Tickets to get
  Description and Company_Contact_Name fields
- Ticket number links to ticket detail page
- Customer column shows Company_Contact_Name with link to debitor detail
- Description column with text-overflow ellipsis
- Last activity column shows formatted date (was: age in hours)
- Backend provides last_activity ISO string and customer_name per ticket
- Table headers use i18n labels via data attributes

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

modules/helpdesk/web/css/helpdesk.css

@@ -202,10 +202,36 @@
   .helpdesk-team-ticket-no {
     font-variant-numeric: tabular-nums;
     font-weight: 500;
+    white-space: nowrap;
+  }
+
+  .helpdesk-team-ticket-no a,
+  .helpdesk-team-ticket-table td a {
+    color: inherit;
+    text-decoration: none;
+  }
+
+  .helpdesk-team-ticket-no a:hover,
+  .helpdesk-team-ticket-table td a:hover {
+    color: var(--app-primary, #0d6efd);
+    text-decoration: underline;
+  }
+
+  .helpdesk-team-ticket-desc {
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    max-width: 20ch;
+  }
+
+  .helpdesk-team-ticket-date {
+    white-space: nowrap;
+    color: var(--app-muted-color);
   }
 
   /* Critical: only highlight the ticket number, not the entire row */
-  .helpdesk-team-ticket-critical .helpdesk-team-ticket-no {
+  .helpdesk-team-ticket-critical .helpdesk-team-ticket-no,
+  .helpdesk-team-ticket-critical .helpdesk-team-ticket-no a {
     color: var(--app-warning, #f59e0b);
     font-weight: 600;
   }