What was broken: Login/upload silently failed for signed-out users, and after signing in, the UI wouldn’t reflect it until a manual refresh.

What you found: Console showed Cross-Origin-Opener-Policy policy would block the window.closed call - the site’s COOP header was preventing Puter’s auth popup from reporting back to the app.

The fix: Added vercel.json with Cross-Origin-Opener-Policy: unsafe-none, plus made the upload dropzone and “Get Started” button properly prompt/guard sign-in instead of failing silently.

Verified: Signed in -> UI updated instantly, no refresh -> uploaded a floor plan -> rendered correctly end-to-end.