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/tough-cookie/dist/cookie/canonicalDomain.js

@@ -0,0 +1,65 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.canonicalDomain = canonicalDomain;
+const constants_1 = require("./constants");
+/**
+ * Normalizes a domain to lowercase and punycode-encoded.
+ * Runtime-agnostic equivalent to node's `domainToASCII`.
+ * @see https://nodejs.org/docs/latest-v22.x/api/url.html#urldomaintoasciidomain
+ */
+function domainToASCII(domain) {
+    return new URL(`http://${domain}`).hostname;
+}
+/**
+ * Transforms a domain name into a canonical domain name. The canonical domain name is a domain name
+ * that has been trimmed, lowercased, stripped of leading dot, and optionally punycode-encoded
+ * ({@link https://www.rfc-editor.org/rfc/rfc6265.html#section-5.1.2 | Section 5.1.2 of RFC 6265}). For
+ * the most part, this function is idempotent (calling the function with the output from a previous call
+ * returns the same output).
+ *
+ * @remarks
+ * A canonicalized host name is the string generated by the following
+ * algorithm:
+ *
+ * 1.  Convert the host name to a sequence of individual domain name
+ *     labels.
+ *
+ * 2.  Convert each label that is not a Non-Reserved LDH (NR-LDH) label,
+ *     to an A-label (see Section 2.3.2.1 of [RFC5890] for the former
+ *     and latter), or to a "punycode label" (a label resulting from the
+ *     "ToASCII" conversion in Section 4 of [RFC3490]), as appropriate
+ *     (see Section 6.3 of this specification).
+ *
+ * 3.  Concatenate the resulting labels, separated by a %x2E (".")
+ *     character.
+ *
+ * @example
+ * ```
+ * canonicalDomain('.EXAMPLE.com') === 'example.com'
+ * ```
+ *
+ * @param domainName - the domain name to generate the canonical domain from
+ * @public
+ */
+function canonicalDomain(domainName) {
+    if (domainName == null) {
+        return undefined;
+    }
+    let str = domainName.trim().replace(/^\./, ''); // S4.1.2.3 & S5.2.3: ignore leading .
+    if (constants_1.IP_V6_REGEX_OBJECT.test(str)) {
+        if (!str.startsWith('[')) {
+            str = '[' + str;
+        }
+        if (!str.endsWith(']')) {
+            str = str + ']';
+        }
+        return domainToASCII(str).slice(1, -1); // remove [ and ]
+    }
+    // convert to IDN if any non-ASCII characters
+    // eslint-disable-next-line no-control-regex
+    if (/[^\u0001-\u007f]/.test(str)) {
+        return domainToASCII(str);
+    }
+    // ASCII-only domain - not canonicalized with new URL() because it may be a malformed URL
+    return str.toLowerCase();
+}