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

src/Rules/InputImageAlt.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace YakNet\AccessibilityConsole\Rules;
+
+use DOMElement;
+use YakNet\AccessibilityConsole\Core\Severity;
+use YakNet\AccessibilityConsole\Core\Violation;
+use YakNet\AccessibilityConsole\Core\WCAGStandard;
+
+class InputImageAlt extends AbstractRule
+{
+    public function getId(): string { return 'WCAG_1_1_1_INPUT_IMAGE_ALT'; }
+    public function getDescription(): string { return '<input type="image"> elements must have an alternative text.'; }
+    public function getStandard(): WCAGStandard { return WCAGStandard::A; }
+    public function getSeverity(): Severity { return Severity::ERROR; }
+    public function getLevel(): int { return 2; }
+
+    public function check(DOMElement $element): ?Violation
+    {
+        if (strtolower($element->tagName) !== 'input') {
+            return null;
+        }
+
+        if (strtolower($element->getAttribute('type')) !== 'image') {
+            return null;
+        }
+
+        $hasAlt = $element->hasAttribute('alt') && trim($element->getAttribute('alt')) !== '';
+        $hasAriaLabel = $element->hasAttribute('aria-label') && trim($element->getAttribute('aria-label')) !== '';
+        $hasAriaLabelledBy = $element->hasAttribute('aria-labelledby') && trim($element->getAttribute('aria-labelledby')) !== '';
+        $hasTitle = $element->hasAttribute('title') && trim($element->getAttribute('title')) !== '';
+
+        if (!$hasAlt && !$hasAriaLabel && !$hasAriaLabelledBy && !$hasTitle) {
+            return $this->createViolation(
+                $element,
+                "<input type=\"image\"> elemanının alternatif metni (alt) bulunmuyor.",
+                "Görsel butonlar (<input type=\"image\">) için alt, aria-label veya title niteliklerinden birini kullanarak amacını açıklayın."
+            );
+        }
+
+        return null;
+    }
+}