MAPG-199 fix issues found by PHPStan

src/Response/HtmlContent.php

@@ -23,6 +23,7 @@ class HtmlContent extends ContentBase
 
         require ROOT . '/cache/views/' . $this->view . '.php';
 
+        // @phpstan-ignore-next-line - SCRIPT_STARTED is defined in main.php
         echo '<!-- __debug__runtime: ' . round((hrtime(true) - SCRIPT_STARTED) / 1e+6, 1) . ' -->';
     }