<ul>
<li><strong>BUG FIX (HIGH)</strong>: inc_links_manager.php — Operator precedence bug on $_SESSION["super_admin"] ?? false == 1 fixed with proper parentheses; Admin tab now shows correctly for super admins</li>
<li><strong>BUG FIX (HIGH)</strong>: inc_links_manager.php — $rsDomain/$domain_name/$rsDomainid undefined when domainid GET param missing; added safe defaults to prevent undefined variable warnings</li>
<li><strong>BUG FIX (HIGH)</strong>: inc_links_manager.php — Unguarded $_GET["domainid"] access replaced with null coalescing; SQL injection vector closed by using intval()</li>
<li><strong>BUG FIX (CRITICAL)</strong>: linkmanager.controller.php — CSRF check logic inverted: && changed to || so invalid tokens are now properly rejected; added die after response</li>
<li><strong>BUG FIX (HIGH)</strong>: linkmanager.controller.php — $input[] typo (missing s) in addLink and updateLink actions caused required field validation to never execute; fixed to $inputs[]</li>
<li><strong>BUG FIX (HIGH)</strong>: custom_js.php — All AJAX calls using dataType:"html" with JSON.parse(res) fixed to dataType:"json" — affects reloadLinksCategoriesTable, reloadLinksTable, deleteLink, addLink, addCat, deleteCateg, updateCat handlers</li>
<li><strong>BUG FIX (MEDIUM)</strong>: custom_js.php — Error handler on addLink AJAX called JSON.parse on jQuery XHR error object (not string); replaced with proper xhr/status/err signature</li>
<li><strong>SPEED FIX</strong>: Added composite index idx_siteid_sitelinkid on domain_tbl_links(siteidkey_fk, sitelinkid_fk) — EXPLAIN changed from type:ALL full scan to type:ref</li>
<li>0 PHP errors, 0 JS console errors, 0 network failures after all fixes</li>
</ul>