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/tough-cookie/dist/cookie/constants.d.ts

@@ -0,0 +1,54 @@
+/**
+ * Cookie prefixes are a way to indicate that a given cookie was set with a set of attributes simply by inspecting the
+ * first few characters of the cookie's name. These are defined in {@link https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-rfc6265bis-13#section-4.1.3 | RFC6265bis - Section 4.1.3}.
+ *
+ * The following values can be used to configure how a {@link CookieJar} enforces attribute restrictions for Cookie prefixes:
+ *
+ * - `silent` - Enable cookie prefix checking but silently ignores the cookie if conditions are not met. This is the default configuration for a {@link CookieJar}.
+ *
+ * - `strict` - Enables cookie prefix checking and will raise an error if conditions are not met.
+ *
+ * - `unsafe-disabled` - Disables cookie prefix checking.
+ * @public
+ */
+export declare const PrefixSecurityEnum: {
+    readonly SILENT: "silent";
+    readonly STRICT: "strict";
+    readonly DISABLED: "unsafe-disabled";
+};
+export declare const IP_V6_REGEX_OBJECT: RegExp;
+/**
+ * A JSON representation of a {@link CookieJar}.
+ * @public
+ */
+export interface SerializedCookieJar {
+    /**
+     * The version of `tough-cookie` used during serialization.
+     */
+    version: string;
+    /**
+     * The name of the store used during serialization.
+     */
+    storeType: string | null;
+    /**
+     * The value of {@link CreateCookieJarOptions.rejectPublicSuffixes} configured on the {@link CookieJar}.
+     */
+    rejectPublicSuffixes: boolean;
+    /**
+     * Other configuration settings on the {@link CookieJar}.
+     */
+    [key: string]: unknown;
+    /**
+     * The list of {@link Cookie} values serialized as JSON objects.
+     */
+    cookies: SerializedCookie[];
+}
+/**
+ * A JSON object that is created when {@link Cookie.toJSON} is called. This object will contain the properties defined in {@link Cookie.serializableProperties}.
+ * @public
+ */
+export type SerializedCookie = {
+    key?: string;
+    value?: string;
+    [key: string]: unknown;
+};