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/permuteDomain.js

@@ -0,0 +1,44 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.permuteDomain = permuteDomain;
+const getPublicSuffix_1 = require("./getPublicSuffix");
+/**
+ * Generates the permutation of all possible values that {@link domainMatch} the given `domain` parameter. The
+ * array is in shortest-to-longest order. Useful when building custom {@link Store} implementations.
+ *
+ * @example
+ * ```
+ * permuteDomain('foo.bar.example.com')
+ * // ['example.com', 'bar.example.com', 'foo.bar.example.com']
+ * ```
+ *
+ * @public
+ * @param domain - the domain to generate permutations for
+ * @param allowSpecialUseDomain - flag to control if {@link https://www.rfc-editor.org/rfc/rfc6761.html | Special Use Domains} such as `localhost` should be allowed
+ */
+function permuteDomain(domain, allowSpecialUseDomain) {
+    const pubSuf = (0, getPublicSuffix_1.getPublicSuffix)(domain, {
+        allowSpecialUseDomain: allowSpecialUseDomain,
+    });
+    if (!pubSuf) {
+        return undefined;
+    }
+    if (pubSuf == domain) {
+        return [domain];
+    }
+    // Nuke trailing dot
+    if (domain.slice(-1) == '.') {
+        domain = domain.slice(0, -1);
+    }
+    const prefix = domain.slice(0, -(pubSuf.length + 1)); // ".example.com"
+    const parts = prefix.split('.').reverse();
+    let cur = pubSuf;
+    const permutations = [cur];
+    while (parts.length) {
+        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+        const part = parts.shift();
+        cur = `${part}.${cur}`;
+        permutations.push(cur);
+    }
+    return permutations;
+}