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/pretty-format/build/plugins/ReactTestComponent.js

@@ -0,0 +1,79 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.test = exports.serialize = exports.default = void 0;
+
+var _markup = require('./lib/markup');
+
+var global = (function () {
+  if (typeof globalThis !== 'undefined') {
+    return globalThis;
+  } else if (typeof global !== 'undefined') {
+    return global;
+  } else if (typeof self !== 'undefined') {
+    return self;
+  } else if (typeof window !== 'undefined') {
+    return window;
+  } else {
+    return Function('return this')();
+  }
+})();
+
+var Symbol = global['jest-symbol-do-not-touch'] || global.Symbol;
+const testSymbol =
+  typeof Symbol === 'function' && Symbol.for
+    ? Symbol.for('react.test.json')
+    : 0xea71357;
+
+const getPropKeys = object => {
+  const {props} = object;
+  return props
+    ? Object.keys(props)
+        .filter(key => props[key] !== undefined)
+        .sort()
+    : [];
+};
+
+const serialize = (object, config, indentation, depth, refs, printer) =>
+  ++depth > config.maxDepth
+    ? (0, _markup.printElementAsLeaf)(object.type, config)
+    : (0, _markup.printElement)(
+        object.type,
+        object.props
+          ? (0, _markup.printProps)(
+              getPropKeys(object),
+              object.props,
+              config,
+              indentation + config.indent,
+              depth,
+              refs,
+              printer
+            )
+          : '',
+        object.children
+          ? (0, _markup.printChildren)(
+              object.children,
+              config,
+              indentation + config.indent,
+              depth,
+              refs,
+              printer
+            )
+          : '',
+        config,
+        indentation
+      );
+
+exports.serialize = serialize;
+
+const test = val => val && val.$$typeof === testSymbol;
+
+exports.test = test;
+const plugin = {
+  serialize,
+  test
+};
+var _default = plugin;
+exports.default = _default;