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/lib/Module/Helpdesk/Service/DebitorDetailService.php

@@ -1651,12 +1651,18 @@ class DebitorDetailService
                     $globalOpenCount++;
                 }
 
+                $lastActivityRaw = trim((string) ($ticket['Last_Activity_Date'] ?? ''));
+                $lastActivityDisplay = ($lastActivityRaw !== '' && !str_starts_with($lastActivityRaw, '0001'))
+                    ? $lastActivityRaw
+                    : trim((string) ($ticket['Created_On'] ?? ''));
+
                 $agents[$normalizedUser]['open_ticket_details'][] = [
                     'no' => trim((string) ($ticket['No'] ?? '')),
                     'description' => trim((string) ($ticket['Description'] ?? '')),
                     'age_hours' => $ageHours,
                     'critical' => $isCritical,
-                    'customer' => trim((string) ($ticket['Customer_No'] ?? '')),
+                    'customer_name' => trim((string) ($ticket['Company_Contact_Name'] ?? '')),
+                    'last_activity' => $lastActivityDisplay,
                 ];
             }
         }