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/dequal/lite/index.js

@@ -0,0 +1,31 @@
+var has = Object.prototype.hasOwnProperty;
+
+function dequal(foo, bar) {
+	var ctor, len;
+	if (foo === bar) return true;
+
+	if (foo && bar && (ctor=foo.constructor) === bar.constructor) {
+		if (ctor === Date) return foo.getTime() === bar.getTime();
+		if (ctor === RegExp) return foo.toString() === bar.toString();
+
+		if (ctor === Array) {
+			if ((len=foo.length) === bar.length) {
+				while (len-- && dequal(foo[len], bar[len]));
+			}
+			return len === -1;
+		}
+
+		if (!ctor || typeof foo === 'object') {
+			len = 0;
+			for (ctor in foo) {
+				if (has.call(foo, ctor) && ++len && !has.call(bar, ctor)) return false;
+				if (!(ctor in bar) || !dequal(foo[ctor], bar[ctor])) return false;
+			}
+			return Object.keys(bar).length === len;
+		}
+	}
+
+	return foo !== foo && bar !== bar;
+}
+
+exports.dequal = dequal;