Wire targeted toast notifications to document status transitions

Adds emit_notification_user() to 7 endpoints so the acting user and
all admins/owners receive a real-time toast on key document actions:
confirm/cancel order, issue/void invoice, confirm return, confirm PO,
receive PO goods. Other staff and viewers are not notified.

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

app/order/api/engine/cancel_order.php

@@ -23,6 +23,7 @@
         $answer['success'] = 1;
         $answer['message'] = 'Order cancelled.';
         notify_node('order_updated', [], $company_id);
+        emit_notification_user($company_id, $user_id, 'Order Cancelled', 'The sales order has been cancelled.', 'warning');
 
     } catch (PDOException $e) {
         $answer['message'] = 'Database error, please try again.';

app/order/api/engine/confirm_order.php

@@ -38,6 +38,7 @@
         $answer['auto_approved'] = $auto_approve;
         $answer['auto_invoice']  = $auto_invoice;
         notify_node('order_updated', [], $company_id);
+        emit_notification_user($company_id, $user_id, 'Order Confirmed', 'The sales order has been confirmed.', 'success');
         if ($auto_invoice) {
             (new UsageGuard($pdo1, $company_id, $packages))->increment();
             notify_node('invoice_updated', [], $company_id);

app/order/api/engine/confirm_return.php

@@ -33,6 +33,7 @@
         $answer['message'] = 'Return confirmed.';
         $answer['auto_cn'] = $auto_cn;
         notify_node('return_updated', [], $company_id);
+        emit_notification_user($company_id, $user_id, 'Return Confirmed', 'The customer return has been confirmed.', 'success');
         if ($auto_approve) {
             notify_node('stock_updated', ['warehouse_id' => 0, 'type' => 'in'], $company_id);
         }

app/order/api/engine/issue_invoice.php

@@ -28,6 +28,8 @@
 
         $answer['success'] = 1;
         $answer['message'] = 'Invoice issued.';
+        require_once '../../../assets/utils/notify_node.php';
+        emit_notification_user($company_id, $user_id, 'Invoice Issued', 'The invoice has been issued.', 'success');
 
         // Auto-post GL for this document
         $sth = $pdo2->prepare("SELECT doc_type, formula_id FROM td_invoice WHERE company_id = :cid AND id = :id LIMIT 1");

app/order/api/engine/void_invoice.php

@@ -22,6 +22,7 @@
         $answer['success'] = 1;
         $answer['message'] = 'Invoice voided.';
         notify_node('invoice_updated', [], $company_id);
+        emit_notification_user($company_id, $user_id, 'Invoice Voided', 'The invoice has been voided.', 'warning');
 
     } catch (PDOException $e) {
         $answer['message'] = 'Database error, please try again.';