fix: resolve PHPStan level 9 errors and bump version to v3.1.3

src/Rules/DefinitionListStructure.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace YakNet\AccessibilityConsole\Rules;
+
+use DOMElement;
+use YakNet\AccessibilityConsole\Core\Severity;
+use YakNet\AccessibilityConsole\Core\Violation;
+use YakNet\AccessibilityConsole\Core\WCAGStandard;
+
+class DefinitionListStructure extends AbstractRule
+{
+    public function getId(): string { return 'WCAG_1_3_1_DefinitionListStructure'; }
+    public function getDescription(): string { return 'Checks that <dl> elements only contain <dt>, <dd>, and <div> as direct children.'; }
+    public function getStandard(): WCAGStandard { return WCAGStandard::A; }
+    public function getSeverity(): Severity { return Severity::ERROR; }
+    public function getLevel(): int { return 3; }
+
+    public function check(DOMElement $element): ?Violation
+    {
+        if (strtolower($element->tagName) !== 'dl') {
+            return null;
+        }
+        
+        $invalidChildren = [];
+        foreach ($element->childNodes as $child) {
+            if ($child instanceof DOMElement) {
+                $childTag = strtolower($child->tagName);
+                if (!in_array($childTag, ['dt', 'dd', 'div'])) {
+                    $invalidChildren[] = $childTag;
+                }
+            }
+        }
+        
+        if (count($invalidChildren) > 0) {
+            return $this->createViolation(
+                $element,
+                '<dl> öğesi doğrudan alt öğe olarak sadece <dt>, <dd> veya <div> içerebilir.',
+                'Remove or wrap invalid children (' . implode(', ', array_unique($invalidChildren)) . ') inside <dd> or <dt>.'
+            );
+        }
+        
+        return null;
+    }
+}