Set up comprehensive frontend testing infrastructure

- Install Jest for unit testing with React Testing Library
- Install Playwright for end-to-end testing
- Configure Jest with proper TypeScript support and module mapping
- Create test setup files and utilities for both unit and e2e tests

Components:
* Jest configuration with coverage thresholds
* Playwright configuration with browser automation
* Unit tests for LoginForm, AuthContext, and useSocketIO hook
* E2E tests for authentication, dashboard, and agents workflows
* GitHub Actions workflow for automated testing
* Mock data and API utilities for consistent testing
* Test documentation with best practices

Testing features:
- Unit tests with 70% coverage threshold
- E2E tests with API mocking and user journey testing
- CI/CD integration for automated test runs
- Cross-browser testing support with Playwright
- Authentication system testing end-to-end

🚀 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/node_modules/dom-accessibility-api/dist/util.mjs

@@ -0,0 +1,81 @@
+export { getLocalName } from "./getRole.mjs";
+import getRole, { getLocalName } from "./getRole.mjs";
+export function isElement(node) {
+  return node !== null && node.nodeType === node.ELEMENT_NODE;
+}
+export function isHTMLTableCaptionElement(node) {
+  return isElement(node) && getLocalName(node) === "caption";
+}
+export function isHTMLInputElement(node) {
+  return isElement(node) && getLocalName(node) === "input";
+}
+export function isHTMLOptGroupElement(node) {
+  return isElement(node) && getLocalName(node) === "optgroup";
+}
+export function isHTMLSelectElement(node) {
+  return isElement(node) && getLocalName(node) === "select";
+}
+export function isHTMLTableElement(node) {
+  return isElement(node) && getLocalName(node) === "table";
+}
+export function isHTMLTextAreaElement(node) {
+  return isElement(node) && getLocalName(node) === "textarea";
+}
+export function safeWindow(node) {
+  var _ref = node.ownerDocument === null ? node : node.ownerDocument,
+    defaultView = _ref.defaultView;
+  if (defaultView === null) {
+    throw new TypeError("no window available");
+  }
+  return defaultView;
+}
+export function isHTMLFieldSetElement(node) {
+  return isElement(node) && getLocalName(node) === "fieldset";
+}
+export function isHTMLLegendElement(node) {
+  return isElement(node) && getLocalName(node) === "legend";
+}
+export function isHTMLSlotElement(node) {
+  return isElement(node) && getLocalName(node) === "slot";
+}
+export function isSVGElement(node) {
+  return isElement(node) && node.ownerSVGElement !== undefined;
+}
+export function isSVGSVGElement(node) {
+  return isElement(node) && getLocalName(node) === "svg";
+}
+export function isSVGTitleElement(node) {
+  return isSVGElement(node) && getLocalName(node) === "title";
+}
+
+/**
+ *
+ * @param {Node} node -
+ * @param {string} attributeName -
+ * @returns {Element[]} -
+ */
+export function queryIdRefs(node, attributeName) {
+  if (isElement(node) && node.hasAttribute(attributeName)) {
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- safe due to hasAttribute check
+    var ids = node.getAttribute(attributeName).split(" ");
+
+    // Browsers that don't support shadow DOM won't have getRootNode
+    var root = node.getRootNode ? node.getRootNode() : node.ownerDocument;
+    return ids.map(function (id) {
+      return root.getElementById(id);
+    }).filter(function (element) {
+      return element !== null;
+    }
+    // TODO: why does this not narrow?
+    );
+  }
+
+  return [];
+}
+export function hasAnyConcreteRoles(node, roles) {
+  if (isElement(node)) {
+    return roles.indexOf(getRole(node)) !== -1;
+  }
+  return false;
+}
+//# sourceMappingURL=util.mjs.map