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/@testing-library/user-event/dist/esm/system/index.js

@@ -0,0 +1,42 @@
+import { KeyboardHost } from './keyboard.js';
+import { PointerHost } from './pointer/index.js';
+
+function _define_property(obj, key, value) {
+    if (key in obj) {
+        Object.defineProperty(obj, key, {
+            value: value,
+            enumerable: true,
+            configurable: true,
+            writable: true
+        });
+    } else {
+        obj[key] = value;
+    }
+    return obj;
+}
+/**
+ * @internal Do not create/alter this by yourself as this type might be subject to changes.
+ */ class System {
+    getUIEventModifiers() {
+        return {
+            altKey: this.keyboard.modifiers.Alt,
+            ctrlKey: this.keyboard.modifiers.Control,
+            metaKey: this.keyboard.modifiers.Meta,
+            shiftKey: this.keyboard.modifiers.Shift,
+            modifierAltGraph: this.keyboard.modifiers.AltGraph,
+            modifierCapsLock: this.keyboard.modifiers.CapsLock,
+            modifierFn: this.keyboard.modifiers.Fn,
+            modifierFnLock: this.keyboard.modifiers.FnLock,
+            modifierNumLock: this.keyboard.modifiers.NumLock,
+            modifierScrollLock: this.keyboard.modifiers.ScrollLock,
+            modifierSymbol: this.keyboard.modifiers.Symbol,
+            modifierSymbolLock: this.keyboard.modifiers.SymbolLock
+        };
+    }
+    constructor(){
+        _define_property(this, "keyboard", new KeyboardHost(this));
+        _define_property(this, "pointer", new PointerHost(this));
+    }
+}
+
+export { System };