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Choose live Google auth or the local demo workflow.
The app is production-shaped, but it stays fully usable without external credentials by falling back to a safe local demo mode.
Google OAuth is wired through NextAuth and becomes available when `AUTH_GOOGLE_ID` and `AUTH_GOOGLE_SECRET` are provided.
The local demo path creates a safe session so you can test the pipeline, analytics, billing fallback, export gating, and calculator flows immediately.