<ul><li>module.controller.php: Fixed all 42 bare $_REQUEST["action"] comparisons (34 previously fixed + 8 remaining at lines 238–274) with null coalescing ?? ""</li><li>modules_tabs.php: Replaced all 18 deprecated $.parseJSON() calls with native JSON.parse()</li><li>modules_tabs.php: Added AJAX error handlers to filterByStatus, filterByPortal, filterByCategory, getAllModules, deleteModule — swal modal no longer gets stuck on failure</li><li>modules_tabs.php: Fixed unsafe JSON.parse(null) for modules with no image_path</li><li>modules_tabs.php: Fixed duplicate class attributes on img elements; fixed malformed HTML comments</li><li>modules/inc/ajax.php: Fixed missing / in DOCUMENT_ROOT include path; fixed bare $_POST["mid"] accesses with ?? 0</li><li>modules/inc/crud.php: Fixed bare $_POST["action"] in switch statement with null coalescing</li><li>Validation: getAllModules=53 modules, filterByStatus=28 active, getCategoriesTable=HTML OK</li></ul>