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/jest-matcher-utils/README.md

@@ -0,0 +1,24 @@
+# jest-matcher-utils
+
+This package's exports are most notably used by `expect`'s [`this.utils`](https://jestjs.io/docs/expect#thisutils).
+
+## Installation
+
+To add this package as a dependency of a project, run either of the following commands:
+
+- `npm install jest-matcher-utils`
+- `yarn add jest-matcher-utils`
+
+## Exports ([src/index.ts](https://github.com/jestjs/jest/blob/HEAD/packages/jest-matcher-utils/src/index.ts))
+
+### Functions
+
+`stringify` `highlightTrailingWhitespace` `printReceived` `printExpected` `printWithType` `ensureNoExpected` `ensureActualIsNumber` `ensureExpectedIsNumber` `ensureNumbers` `ensureExpectedIsNonNegativeInteger` `printDiffOrStringify` `diff` `pluralize` `getLabelPrinter` `matcherErrorMessage` `matcherHint`
+
+### Types
+
+`MatcherHintOptions` `DiffOptions`
+
+### Constants
+
+`EXPECTED_COLOR` `RECEIVED_COLOR` `INVERTED_COLOR` `BOLD_WEIGHT` `DIM_COLOR` `SUGGEST_TO_CONTAIN_EQUAL` `SERIALIZABLE_PROPERTIES`