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/deepmerge/index.d.ts

@@ -0,0 +1,20 @@
+declare function deepmerge<T>(x: Partial<T>, y: Partial<T>, options?: deepmerge.Options): T;
+declare function deepmerge<T1, T2>(x: Partial<T1>, y: Partial<T2>, options?: deepmerge.Options): T1 & T2;
+
+declare namespace deepmerge {
+	export interface Options {
+		arrayMerge?(target: any[], source: any[], options?: ArrayMergeOptions): any[];
+		clone?: boolean;
+		customMerge?: (key: string, options?: Options) => ((x: any, y: any) => any) | undefined;
+		isMergeableObject?(value: object): boolean;
+	}
+	export interface ArrayMergeOptions {
+		isMergeableObject(value: object): boolean;
+		cloneUnlessOtherwiseSpecified(value: object, options?: Options): object;
+	}
+
+	export function all (objects: object[], options?: Options): object;
+	export function all<T> (objects: Partial<T>[], options?: Options): T;
+}
+
+export = deepmerge;