fix: normalize role/aria-hidden values — trim + lowercase (Copilot review)

Author: johanrd

lib/rules/template-no-nested-interactive.js

@@ -32,7 +32,15 @@ function getTextAttr(node, name) {
 const MENUITEM_ROLES = new Set(['menuitem', 'menuitemcheckbox', 'menuitemradio']);
 
 function getRole(node) {
-  return getTextAttr(node, 'role');
+  // ARIA role values are case-insensitive per HTML spec. Match the
+  // normalization used elsewhere (template-no-invalid-role, etc.) and split
+  // on whitespace to honor role-fallback — we use the first token here,
+  // which matches how aria-query and elementRoles resolve roles.
+  const raw = getTextAttr(node, 'role');
+  if (!raw) {
+    return raw;
+  }
+  return raw.trim().toLowerCase().split(/\s+/u)[0];
 }
 
 function isCompositeWidgetPattern(parentRole, childRole) {