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

src/Rules/ClickHandlerKeyboard.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace YakNet\AccessibilityConsole\Rules;
+
+use DOMElement;
+use YakNet\AccessibilityConsole\Core\Severity;
+use YakNet\AccessibilityConsole\Core\Violation;
+use YakNet\AccessibilityConsole\Core\WCAGStandard;
+
+class ClickHandlerKeyboard extends AbstractRule
+{
+    public function getId(): string { return 'WCAG_2_1_1_CLICK_KEYBOARD'; }
+    public function getDescription(): string { return 'Non-interactive elements with click handlers should also have keyboard handlers.'; }
+    public function getStandard(): WCAGStandard { return WCAGStandard::A; }
+    public function getSeverity(): Severity { return Severity::WARNING; }
+    public function getLevel(): int { return 4; }
+
+    public function check(DOMElement $element): ?Violation
+    {
+        if (!$element->hasAttribute('onclick')) {
+            return null;
+        }
+        
+        $tagName = strtolower($element->tagName);
+        $interactiveElements = ['a', 'button', 'input', 'select', 'textarea', 'summary', 'details'];
+        if (in_array($tagName, $interactiveElements)) {
+            return null;
+        }
+
+        $role = strtolower($element->getAttribute('role'));
+        if (($role === 'button' || $role === 'link') && $element->hasAttribute('tabindex')) {
+            return null;
+        }
+
+        if ($element->hasAttribute('onkeydown') || $element->hasAttribute('onkeyup') || $element->hasAttribute('onkeypress')) {
+            return null;
+        }
+
+        return $this->createViolation(
+            $element,
+            'onclick olay işleyicisine sahip etkileşimli olmayan öğenin klavye işleyicisi (onkeydown vb.) eksik. / Non-interactive element with onclick is missing a keyboard handler.',
+            'Klavye desteği için onkeydown/onkeyup ekleyin ve tabindex="0" tanımlayın. / Add onkeydown/onkeyup handlers and tabindex="0" for keyboard support.'
+        );
+    }
+}