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/tldts/src/suffix-trie.ts

@@ -0,0 +1,110 @@
+import {
+  fastPathLookup,
+  IPublicSuffix,
+  ISuffixLookupOptions,
+} from 'tldts-core';
+import { exceptions, ITrie, rules } from './data/trie';
+
+// Flags used to know if a rule is ICANN or Private
+const enum RULE_TYPE {
+  ICANN = 1,
+  PRIVATE = 2,
+}
+
+interface IMatch {
+  index: number;
+  isIcann: boolean;
+  isPrivate: boolean;
+}
+
+/**
+ * Lookup parts of domain in Trie
+ */
+function lookupInTrie(
+  parts: string[],
+  trie: ITrie,
+  index: number,
+  allowedMask: number,
+): IMatch | null {
+  let result: IMatch | null = null;
+  let node: ITrie | undefined = trie;
+  while (node !== undefined) {
+    // We have a match!
+    if ((node[0] & allowedMask) !== 0) {
+      result = {
+        index: index + 1,
+        isIcann: node[0] === RULE_TYPE.ICANN,
+        isPrivate: node[0] === RULE_TYPE.PRIVATE,
+      };
+    }
+
+    // No more `parts` to look for
+    if (index === -1) {
+      break;
+    }
+
+    const succ: { [label: string]: ITrie } = node[1];
+    node = Object.prototype.hasOwnProperty.call(succ, parts[index]!)
+      ? succ[parts[index]!]
+      : succ['*'];
+    index -= 1;
+  }
+
+  return result;
+}
+
+/**
+ * Check if `hostname` has a valid public suffix in `trie`.
+ */
+export default function suffixLookup(
+  hostname: string,
+  options: ISuffixLookupOptions,
+  out: IPublicSuffix,
+): void {
+  if (fastPathLookup(hostname, options, out)) {
+    return;
+  }
+
+  const hostnameParts = hostname.split('.');
+
+  const allowedMask =
+    (options.allowPrivateDomains ? RULE_TYPE.PRIVATE : 0) |
+    (options.allowIcannDomains ? RULE_TYPE.ICANN : 0);
+
+  // Look for exceptions
+  const exceptionMatch = lookupInTrie(
+    hostnameParts,
+    exceptions,
+    hostnameParts.length - 1,
+    allowedMask,
+  );
+
+  if (exceptionMatch !== null) {
+    out.isIcann = exceptionMatch.isIcann;
+    out.isPrivate = exceptionMatch.isPrivate;
+    out.publicSuffix = hostnameParts.slice(exceptionMatch.index + 1).join('.');
+    return;
+  }
+
+  // Look for a match in rules
+  const rulesMatch = lookupInTrie(
+    hostnameParts,
+    rules,
+    hostnameParts.length - 1,
+    allowedMask,
+  );
+
+  if (rulesMatch !== null) {
+    out.isIcann = rulesMatch.isIcann;
+    out.isPrivate = rulesMatch.isPrivate;
+    out.publicSuffix = hostnameParts.slice(rulesMatch.index).join('.');
+    return;
+  }
+
+  // No match found...
+  // Prevailing rule is '*' so we consider the top-level domain to be the
+  // public suffix of `hostname` (e.g.: 'example.org' => 'org').
+  out.isIcann = false;
+  out.isPrivate = false;
+  out.publicSuffix = hostnameParts[hostnameParts.length - 1] ?? null;
+}