NEXT_PUBLIC_STACK_API_URL=# the base URL of Stack's backend/API. For local development, this is `http://localhost:8102`; for the managed service, this is `https://api.hexclave.com`.
NEXT_PUBLIC_SERVER_STACK_API_URL=# optional server-side override for the backend/API URL. If unset, falls back to NEXT_PUBLIC_STACK_API_URL.
NEXT_PUBLIC_POSTHOG_KEY=# optional PostHog project key for analytics. Leave blank to use the default public key.