feat: add Pending status for delivery/technician tasks

- New 'pending' status allows tasks to be created without a schedule,
  acting as a queue for unscheduled work that gets assigned later
- Pending group appears in the Delivery Map sidebar with amber color
- Other modules can create tasks in pending state for scheduling
- scheduled_date no longer required (null for pending tasks)
- New Pending Tasks menu item under Field Service
- Pending filter added to search view

Co-authored-by: Cursor <cursoragent@cursor.com>

fusion_claims/static/src/xml/fusion_task_map_view.xml

@@ -165,6 +165,7 @@
                             </button>
                             <span class="border-start mx-1" style="height:20px;"/>
                             <span class="text-muted fw-bold" style="font-size:11px;">Pins:</span>
+                            <span style="font-size:11px;"><i class="fa fa-map-marker me-1" style="color:#f59e0b;"/>Pending</span>
                             <span style="font-size:11px;"><i class="fa fa-map-marker me-1" style="color:#ef4444;"/>Today</span>
                             <span style="font-size:11px;"><i class="fa fa-map-marker me-1" style="color:#3b82f6;"/>Tomorrow</span>
                             <span style="font-size:11px;"><i class="fa fa-map-marker me-1" style="color:#10b981;"/>This Week</span>