<ul><li>Fixed <code>$domainsite_params</code> undefined in <code>pagedata.php</code> (shared entry point for all module admin pages) — affected every module route via <code>?webmod=1&page=...</code></li><li>Fixed <code>$domainsite_params</code> undefined in <code>SolutionsManager/inc_solutions_manager.php</code>, <code>ProductsManager/inc_products_manager.php</code>, <code>ServicesManager/inc_services_manager.php</code> — cascade fix across all 3 catalog managers</li><li>Fixed <code>$CATEGORY_ID</code> undefined in <code>SolutionsManager/page/solutions/layout_solutions.php</code> — used on lines 26 and 37 without isset guard; added <code>$CATEGORY_ID = $CATEGORY_ID ?? null</code> at top</li><li>Fixed <code>preview_page.php</code>: replaced PHP8-incompatible <code>$_GET['mid'] ? ... : $mid</code> ternary with <code>!empty($_GET['mid']) ? ... : ($mid ?? '')</code>; also guarded <code>$_SERVER['REQUEST_SCHEME']</code> with <code>?? 'https'</code></li></ul>