Implement RBAC migration and role management enhancements

- Added AJAX functionality to fetch role permissions for copying.
- Introduced system role management with permission checks for updates.
- Implemented role deletion with confirmation modal and backend handling.
- Enhanced user role assignment migration scripts to transition from legacy profiles to RBAC.
- Created SQL migration scripts for user roles and permissions mapping.
- Updated user interface to support new role management features including copy permissions and system role indicators.

factuur.php

@@ -104,7 +104,7 @@ if (isset($_POST['email_invoice'])) {
     $attachment = $dompdf->output();
     $attachment_name = $file_name . '.pdf';
 
-    $header_redirect = 'Location: index.php?page=order&id=' . $order_id . '&success=invoice_sent';
+    $header_redirect = 'Location: index.php?page=order&txn_id=' . $order_id . '&success=invoice_sent';
     
     // Send to PHPMailer
     send_mail($to, $subject, $message, $attachment, $attachment_name);
@@ -120,7 +120,7 @@ if (isset($_POST['email_invoice_to_admin'])) {
     $attachment = $dompdf->output();
     $attachment_name = $file_name . '.pdf';
 
-    $header_redirect = 'Location: index.php?page=order&id=' . $order_id . '&success=invoice_sent_admin';
+    $header_redirect = 'Location: index.php?page=order&txn_id=' . $order_id . '&success=invoice_sent_admin';
     
     // Send to bookkeeping if configured
     if (invoice_bookkeeping && email_bookkeeping) {
@@ -144,7 +144,7 @@ if (isset($_GET['show_invoice'])) {
 }
 
 // If no action specified, redirect back
-header('Location: index.php?page=order&id=' . $order_number);
+header('Location: index.php?page=order&txn_id=' . $order_number);
 exit;
 
 ?>