Keep framework marker aliases aligned across test runners

When a server helper gains a Next.js server-only marker, check every test runner that imports it transitively. A passing main Vitest suite does not establish that dedicated Vitest configurations or Playwright can resolve that marker. Keep any inert replacement scoped to test configuration; preserve the application compiler configuration and framework enforcement. Validate collection through production-source import chains before paying for full browser execution. Collection success only proves import compatibility; provisioned integration and browser execution must still verify behavior.

Applies when: Framework boundary markers enter shared helpers used by multiple test runners. Keywords: Next.js server-only Vitest Playwright tsconfig alias collection transitive imports