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/async/internal/asyncEachOfLimit.js

@@ -0,0 +1,75 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = asyncEachOfLimit;
+
+var _breakLoop = require('./breakLoop.js');
+
+var _breakLoop2 = _interopRequireDefault(_breakLoop);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+// for async generators
+function asyncEachOfLimit(generator, limit, iteratee, callback) {
+    let done = false;
+    let canceled = false;
+    let awaiting = false;
+    let running = 0;
+    let idx = 0;
+
+    function replenish() {
+        //console.log('replenish')
+        if (running >= limit || awaiting || done) return;
+        //console.log('replenish awaiting')
+        awaiting = true;
+        generator.next().then(({ value, done: iterDone }) => {
+            //console.log('got value', value)
+            if (canceled || done) return;
+            awaiting = false;
+            if (iterDone) {
+                done = true;
+                if (running <= 0) {
+                    //console.log('done nextCb')
+                    callback(null);
+                }
+                return;
+            }
+            running++;
+            iteratee(value, idx, iterateeCallback);
+            idx++;
+            replenish();
+        }).catch(handleError);
+    }
+
+    function iterateeCallback(err, result) {
+        //console.log('iterateeCallback')
+        running -= 1;
+        if (canceled) return;
+        if (err) return handleError(err);
+
+        if (err === false) {
+            done = true;
+            canceled = true;
+            return;
+        }
+
+        if (result === _breakLoop2.default || done && running <= 0) {
+            done = true;
+            //console.log('done iterCb')
+            return callback(null);
+        }
+        replenish();
+    }
+
+    function handleError(err) {
+        if (canceled) return;
+        awaiting = false;
+        done = true;
+        callback(err);
+    }
+
+    replenish();
+}
+module.exports = exports.default;