feat: add Enterprise Connect support

[gyaneshgouraw-okta]

Summary

Adds Enterprise Connect support to auth0-react through a new useEnterpriseConnect hook for enterprise domain discovery and SSO login.

B2B SaaS applications can use it to detect whether a user’s email domain is configured for enterprise SSO, then initiate login with the email as login_hint. Auth0’s Home Realm Discovery uses it to resolve the appropriate enterprise connection and organization.

Changes

• Add useEnterpriseConnect with isFederatedDomain for domain discovery and loginWithSSO for SSO login with login_hint.
• Use the Auth0 domain configured in Auth0Provider for discovery.
• Add unit tests for domain discovery and SSO login behavior.
• Document the Enterprise Connect login, callback, and federated logout flow in EXAMPLES.md.

Example

import { useEnterpriseConnect } from '@auth0/auth0-react';
const { isFederatedDomain, loginWithSSO } = useEnterpriseConnect();

const emailDomain = email.split('@')[1];
if (await isFederatedDomain(emailDomain)) {
  await loginWithSSO(email, { appState: { returnTo: '/dashboard' } });
}

Federated logout (required to end the enterprise IdP session):

await logout({ logoutParams: { federated: true, returnTo: window.location.origin } });

Testing

• npm test: 171 tests pass, 100% coverage including use-enterprise-connect.tsx.
• npm run build: hook bundles cleanly; no augment or internal types leak into dist/.
• Manually tested the flow using an example app with e2e setup

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