SEV-1: blocks launch
A server secret has a browser-visible name
What goes wrong
Your build tool copies it into the JavaScript every visitor downloads, where anyone can read it.
How to fix it
Rename this variable without the public prefix, and move the call that needs it into a server route or edge function.
Check your app
npx sigshipRun it in your project. It reports this check as public-env-secret, along with 16 others. Nothing leaves your machine.