refactor: sync html-interactive-content util to canonical (Copilot review)

Author: johanrd

lib/utils/html-interactive-content.js

@@ -63,7 +63,7 @@ function isHtmlInteractiveContent(node, getTextAttrValue, options = {}) {
   // input — interactive unless type="hidden"
   if (tag === 'input') {
     const type = getTextAttrValue(node, 'type');
-    return type !== 'hidden';
+    return type === undefined || type === null || type.trim().toLowerCase() !== 'hidden';
   }
 
   // a — interactive only when href is present

tests/lib/utils/html-interactive-content-test.js

@@ -53,6 +53,18 @@ describe('isHtmlInteractiveContent', () => {
         isHtmlInteractiveContent(makeNode('input', { type: 'hidden' }), getTextAttrValue)
       ).toBe(false);
     });
+
+    it('is NOT interactive when type="HIDDEN" (case-insensitive)', () => {
+      expect(
+        isHtmlInteractiveContent(makeNode('input', { type: 'HIDDEN' }), getTextAttrValue)
+      ).toBe(false);
+    });
+
+    it('is NOT interactive when type=" hidden " (whitespace-trimmed)', () => {
+      expect(
+        isHtmlInteractiveContent(makeNode('input', { type: ' hidden ' }), getTextAttrValue)
+      ).toBe(false);
+    });
   });
 
   describe('<a>', () => {