fix(build): resolve production deploy failures in Vercel's function build

[collinsezedike]

Summary

Production has failed to deploy on every merge to main since #635, roughly 14 hours as of this PR. The root cause is two independent build bugs that a "redeploy without build cache" does not fix, since neither is actually a caching issue:

1. Vercel's isolated per-function build for api/**/*.ts cannot reliably resolve @meridian/shared/@meridian/api-core/@meridian/stellar-sdk-helpers's exports through their package.json#types field, which points directly at src/index.ts. scripts/build-vercel.sh only esbuild-bundles these three packages' JS and never generates their .d.ts files, even though each package's own tsconfig.json already sets declaration: true. Fixed by running tsc --emitDeclarationOnly for each in the build script and pointing types at the resulting dist/index.d.ts.
2. The production apps/web build fails outright with Rolldown failed to resolve import "tslib" from rxjs, a transitive dependency of @creit.tech/xbull-wallet-connect (added in feat(wallet): add XBullWallet adapter #598). rxjs's ESM5 build imports tslib without it being resolvable in the dependency tree under Vite 8's Rolldown bundler. Fixed by adding tslib as a direct dependency of apps/web.

Both were verified by running scripts/build-vercel.sh locally end to end, which now completes successfully and produces the full dist/ output (landing, app, docs) that previously failed on both counts.

Test plan

• bash scripts/build-vercel.sh (via pnpm exec) completes successfully end to end
• pnpm typecheck and pnpm typecheck:api pass
• pnpm lint passes
• pnpm test passes (146/146 web tests, full suite)
• Generated .d.ts files for shared/api-core/stellar-sdk-helpers contain the expected exports

[vercel]

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Project	Deployment	Actions	Updated
meridian	Error		Sep 1, 2026 10:16am UTC