Stabilize React Supabase Portal

MTL Portal already runs in staging on Vercel with a React.js front-end and Supabase back-end, but the build is still too fragile for production. My immediate goal is to have you take full ownership of the codebase and get one rock-solid first release out the door... (Budget: $15 - $25 USD, Jobs: CI/CD, Frontend Development, HTML, JavaScript, Node.js, PHP, React.js, Supabase, Vercel, Web Development)