Recalculate WO total after saving discount_pct

afterSave() calls recalcTotal() so discount_pct changes are applied
to the total immediately on save, then fillForm() refreshes the
displayed total field.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Filament/Tenant/Resources/WorkOrderResource/Pages/EditWorkOrder.php

@@ -28,6 +28,12 @@ class EditWorkOrder extends EditRecord
         return \Filament\Resources\Pages\Enums\ContentTabPosition::After;
     }
 
+    protected function afterSave(): void
+    {
+        $this->record->recalcTotal();
+        $this->fillForm();
+    }
+
     protected function getHeaderActions(): array
     {
         return [