<ul><li>Fixed <code>onboarding/index.php</code> lines 12 and 53: <code>$_SESSION["super_admin"]</code> undefined — guarded with <code>?? 0</code></li><li>Fixed <code>gbl_ns_vars.php</code> line 17: <code>$_SESSION["super_admin"]</code> undefined — guarded with <code>?? 0</code></li><li>Fixed <code>js/custom_js.php</code> lines 4-5: <code>$_GET["active"]</code> and <code>$_GET["tour_id"]</code> undefined — replaced ternary with <code>!empty()</code> checks</li><li>Fixed <code>pages/widgets/manage_widget.php</code> lines 7-9: <code>$data</code> null when wid not found — guarded all fields with <code>?? null</code> / <code>!empty()</code></li><li>Fixed <code>pages/widgets/manage_widget.php</code> lines 401, 442, 483: <code>$data["widget_tempid_fk"]</code> and <code>$template["widget_template_name"]</code> null access — guarded with <code>?? null</code> / <code>?? &#39;&#39;</code></li><li>All 9 routes return 0 PHP errors</li></ul>