Fix selector scoping for Storybook iframe-prefixed selectors

Strip the iframe-piercing prefix (e.g. #storybook-preview-iframe >>> iframe>)
from violation selectors before calling querySelector. This is a no-op for
plain selectors outside Storybook.

Author: ckundo

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@accesslint/vitest",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "description": "Accessibility assertions for Vitest — toBeAccessible() matcher powered by AccessLint",
   "license": "MIT",
   "publishConfig": {

src/matchers.ts

@@ -19,7 +19,8 @@ function scopeViolationsToElement(
 ): Violation[] {
   return violations.filter((v) => {
     try {
-      const el = root.ownerDocument.querySelector(v.selector);
+      const local = v.selector.replace(/^.*>>>\s*iframe>\s*/, "");
+      const el = root.ownerDocument.querySelector(local);
       return el && root.contains(el);
     } catch {
       return false;