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.d.ts

@@ -0,0 +1,33 @@
+import type { Nullable } from '../utils';
+/**
+ * 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
+ */
+export declare function canonicalDomain(domainName: Nullable<string>): string | undefined;