Are you sure?
Open js/config.js and replace the placeholder values with your Supabase project credentials.
window.APP_CONFIG = {
SUPABASE_URL: 'https://xxxx.supabase.co',
SUPABASE_ANON_KEY: 'eyJhbGci...',
...
};
Get these from: Supabase → Project Settings → API
Then run the SQL in supabase-schema.sql in your Supabase SQL Editor.