fix: Reset save button after error handling

feat: Clear review mode and revert to edit mode when navigating to next item
feat: Implement close button functionality
fix: Handle edge case with zero delivery notes
feat: Add new type field with free text option
fix: Enable cancellation reversal in WarehouseAdmin
improve: Enhance article search autocomplete functionality

lib/mvcfronk/mfBase/mfBaseController.php

@@ -371,7 +371,7 @@ class mfBaseController
     }
 
     public static function sendError(string $message): void {
-        http_response_code(422); // More appropriate status for validation errors
+        http_response_code(500);
         self::returnJson(['success' => false, 'message' => $message]);
         exit;
     }