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/ts-jest/dist/utils/sha1.js

@@ -0,0 +1,38 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.cache = void 0;
+exports.sha1 = sha1;
+const crypto_1 = require("crypto");
+/**
+ * @internal
+ */
+// stores hashes made out of only one argument being a string
+exports.cache = Object.create(null);
+/**
+ * @internal
+ */
+function sha1(...data) {
+    const canCache = data.length === 1 && typeof data[0] === 'string';
+    // caching
+    let cacheKey;
+    if (canCache) {
+        cacheKey = data[0];
+        if (cacheKey in exports.cache) {
+            return exports.cache[cacheKey];
+        }
+    }
+    // we use SHA1 because it's the fastest provided by node
+    // and we are not concerned about security here
+    const hash = (0, crypto_1.createHash)('sha1');
+    data.forEach((item) => {
+        if (typeof item === 'string')
+            hash.update(item, 'utf8');
+        else
+            hash.update(item);
+    });
+    const res = hash.digest('hex').toString();
+    if (canCache) {
+        exports.cache[cacheKey] = res;
+    }
+    return res;
+}