feat: hide editor title bar when embedded in iframe

[Copilot]

The editor's top title bar (Casbin logo and "Policy Editor" text) now hides automatically when the application is embedded in an iframe, providing a cleaner embedded experience.

Changes

• app/utils/iframeDetector.ts (new): Detects iframe context via window.self !== window.top with cross-origin error handling and SSR safety check

• app/components/editor/index.tsx: Conditionally renders header using memoized iframe detection

// Detect once on mount, value doesn't change during session
const isIframe = useMemo(() => {
  return isInsideIframe();
}, []);

// Conditionally render header
{!isIframe && (
  <div className="...">
    <img src="..." alt="Casbin Logo" />
    <span>Policy Editor</span>
    ...
  </div>
)}

Screenshots

Normal view (title bar visible):

Iframe view (title bar hidden):

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[feature] hide the editor's top title bar when it's inside iframe</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [feature] hide the editor's top title bar when it's inside iframe #367

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