buffer polyfill is used directly but not declared as a project dependency

[abayomicornelius]

src/main.tsx explicitly does import { Buffer } from 'buffer' and polyfills window.Buffer for the Stellar SDK, but buffer does not appear in package.json's dependencies — it's only present in package-lock.json as a transitive dependency (currently pulled in indirectly, likely via @stellar/stellar-sdk).

If that transitive chain ever changes (an SDK upgrade, a lockfile regeneration), the app will fail to build/run with a confusing "module not found" error. Add buffer as an explicit direct dependency to pin this intentional usage.