fix(navbar): recognize authenticated users with active sessions

[Copilot]

Authenticated users on cloud.layer5.io were not recognized on docs.layer5.io because checkUserAuth bailed out before making the API call when the provider_token cookie wasn't present on the docs subdomain. Safari and other browsers with strict cookie isolation are particularly affected.

Changes:

• Removed early throw when provider_token cookie is absent — the function now always attempts the API call
• Added credentials: 'include' to the fetch so the browser sends cloud.layer5.io session cookies cross-origin
• ****** still sent when the local cookie exists (backward compatible)

const fetchOptions = {
  method: 'GET',
  credentials: 'include',
};

if (token) {
  fetchOptions.headers = {
    'Authorization': `******
  };
}

const re = await fetch(`${cloudAppUrl}/api/identity/users/profile`, fetchOptions);

Note: This requires the cloud.layer5.io API to respond with appropriate Access-Control-Allow-Credentials: true and Access-Control-Allow-Origin headers for docs.layer5.io. If CORS isn't already configured for credentialed requests, a corresponding server-side change will be needed.

[github-actions]

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