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/parse5/dist/tree-adapters/default.d.ts

@@ -0,0 +1,84 @@
+import { DOCUMENT_MODE, type NS } from '../common/html.js';
+import type { Attribute, Location, ElementLocation } from '../common/token.js';
+import type { TreeAdapter, TreeAdapterTypeMap } from './interface.js';
+export interface Document {
+    /** The name of the node. */
+    nodeName: '#document';
+    /**
+     * Document mode.
+     *
+     * @see {@link DOCUMENT_MODE} */
+    mode: DOCUMENT_MODE;
+    /** The node's children. */
+    childNodes: ChildNode[];
+    /** Comment source code location info. Available if location info is enabled. */
+    sourceCodeLocation?: Location | null;
+}
+export interface DocumentFragment {
+    /** The name of the node. */
+    nodeName: '#document-fragment';
+    /** The node's children. */
+    childNodes: ChildNode[];
+    /** Comment source code location info. Available if location info is enabled. */
+    sourceCodeLocation?: Location | null;
+}
+export interface Element {
+    /** Element tag name. Same as {@link tagName}. */
+    nodeName: string;
+    /** Element tag name. Same as {@link nodeName}. */
+    tagName: string;
+    /** List of element attributes. */
+    attrs: Attribute[];
+    /** Element namespace. */
+    namespaceURI: NS;
+    /** Element source code location info, with attributes. Available if location info is enabled. */
+    sourceCodeLocation?: ElementLocation | null;
+    /** Parent node. */
+    parentNode: ParentNode | null;
+    /** The node's children. */
+    childNodes: ChildNode[];
+}
+export interface CommentNode {
+    /** The name of the node. */
+    nodeName: '#comment';
+    /** Parent node. */
+    parentNode: ParentNode | null;
+    /** Comment text. */
+    data: string;
+    /** Comment source code location info. Available if location info is enabled. */
+    sourceCodeLocation?: Location | null;
+}
+export interface TextNode {
+    nodeName: '#text';
+    /** Parent node. */
+    parentNode: ParentNode | null;
+    /** Text content. */
+    value: string;
+    /** Comment source code location info. Available if location info is enabled. */
+    sourceCodeLocation?: Location | null;
+}
+export interface Template extends Element {
+    nodeName: 'template';
+    tagName: 'template';
+    /** The content of a `template` tag. */
+    content: DocumentFragment;
+}
+export interface DocumentType {
+    /** The name of the node. */
+    nodeName: '#documentType';
+    /** Parent node. */
+    parentNode: ParentNode | null;
+    /** Document type name. */
+    name: string;
+    /** Document type public identifier. */
+    publicId: string;
+    /** Document type system identifier. */
+    systemId: string;
+    /** Comment source code location info. Available if location info is enabled. */
+    sourceCodeLocation?: Location | null;
+}
+export type ParentNode = Document | DocumentFragment | Element | Template;
+export type ChildNode = Element | Template | CommentNode | TextNode | DocumentType;
+export type Node = ParentNode | ChildNode;
+export type DefaultTreeAdapterMap = TreeAdapterTypeMap<Node, ParentNode, ChildNode, Document, DocumentFragment, Element, CommentNode, TextNode, Template, DocumentType>;
+export declare const defaultTreeAdapter: TreeAdapter<DefaultTreeAdapterMap>;