fix(ci): skip chrome-headless-shell download to avoid flaky install failure

Tests launch full Chrome via headless: 'new', so chrome-headless-shell is never used. Its download intermittently fails in CI (archive extracts without an executable), breaking npm install. Skip it via .puppeteerrc.cjs.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: JacksonWeber

.puppeteerrc.cjs

@@ -0,0 +1,13 @@
+/**
+ * Puppeteer configuration.
+ *
+ * Tests launch full Chrome via `headless: "new"` (see gruntfile.js / tools/grunt-tasks/qunit.js),
+ * so the separate chrome-headless-shell binary is never used. Skipping its download avoids a
+ * flaky CI install failure where the headless-shell archive extracts without an executable
+ * ("browser folder exists but the executable is missing").
+ */
+module.exports = {
+    "chrome-headless-shell": {
+        skipDownload: true
+    }
+};