chore: fail fast on dev builds, stop running shared tests twice

[Musiker15]

Two small fixes for things that cost time before.

Build guard for NODE_ENV (apps/web)

pnpm build now runs scripts/assert-build-env.mjs first. If NODE_ENV is set to anything other than production, it stops with a short explanation and the right command.

Background (2026-09-01): the local .env sets NODE_ENV=development for pnpm dev. Sourcing it to get DATABASE_URL made the production build load React's development bundle, and the prerender of /_global-error failed with Cannot read properties of null (reading 'useContext'). That message looks like a duplicate React or a Windows problem, and it took two wrong guesses to find the real cause. CI and the deploy never set NODE_ENV, so neither is affected.

Checked: exits 1 with NODE_ENV=development, 0 when unset and 0 with production.

Tests ran twice from dist

packages/shared builds with plain tsc, its tsconfig includes the test files, so dist/*.test.js gets emitted. test depends on ^build in turbo, and vitest no longer excludes dist by default, so CI collected every shared suite twice and local counts changed depending on whether dist existed.

• packages/shared/vitest.config.ts limits collection to src/**/*.test.ts.
• The same config (src/**/*.test.ts, .tsx for ui) is added to the other packages that emit into dist/: packages/db, packages/ui, packages/i18n, apps/realtime. None of them has tests yet, so nothing runs twice there today, but the first test added would. apps/bot (tsc --noEmit) and apps/web (next build, noEmit) don't emit and are not affected.

I left the test files in the tsc build. dist/ is not consumed by anything (all packages export their sources), and excluding them would need a separate build tsconfig so typecheck keeps covering the tests.

Verification

rm -rf dist alone is not enough to reproduce this locally. tsconfig.base.json sets incremental: true and the tsconfig.tsbuildinfo sits next to dist/, not in it, so after deleting only dist/ a tsc build considers itself up to date and emits nothing. The checks below therefore delete both.

rm -rf packages/shared/dist packages/shared/tsconfig.tsbuildinfo
pnpm --filter @msk-forms/shared build     # 10 *.test.js files in dist

	Test files	Tests
without the config	20	188
with the config	10	94

With the compiled test files present, vitest run --reporter=verbose lists only src/*.test.ts files. After a clean build of db, ui, i18n and realtime, none of them has *.test.js in dist and each reports "No test files found" as before. bot still runs its 3 files.

(The counts are from this branch, which predates form-definition.test.ts from #261. With that merged it is 11 files.)