Fix: Tilføj case_number og Hub ordre nr til e-conomic

- Varetekst: Tilføj case_number tilbage (CC5784)
- Format: 'CC5784 / Arbejde konstant / 09.12.2025 - Marley'
- Tilføj Hub ordre nummer (TT-20251222-005) til otherReference felt
- otherReference vises som 'Øvrig ref' i e-conomic

app/timetracking/backend/economic_export.py

@@ -259,6 +259,7 @@ class EconomicExportService:
                 "date": order['order_date'].isoformat() if hasattr(order['order_date'], 'isoformat') else str(order['order_date']),
                 "currency": "DKK",
                 "exchangeRate": 100,
+                "otherReference": order['order_number'],  # Hub ordre nummer (TT-20251222-005)
                 "customer": {
                     "customerNumber": customer_number
                 },
@@ -306,10 +307,10 @@ class EconomicExportService:
                         time_date = datetime.fromisoformat(time_date).date()
                     date_str = time_date.strftime("%d.%m.%Y")
                 
-                # Build description (without hours/price/total - only task details)
+                # Build description (case_number + task details)
                 contact_part = f" - {line['case_contact']}" if line.get('case_contact') else ""
                 travel_marker = " - (Udkørsel)" if line.get('is_travel') else ""
-                formatted_desc = f"{case_title} / {date_str}{contact_part}{travel_marker}"
+                formatted_desc = f"{case_number} / {case_title} / {date_str}{contact_part}{travel_marker}"
                 
                 economic_line = {
                     "lineNumber": idx,