next.js

6773ea86 - fix: improve error message when `output: export` in app router (#54202)

fix: improve error message when `output: export` in app router (#54202) There are a few cases that are not handled by App Router when using `output: export` config. A few of them are expected, but some are yet to be implemented. Regardless of the intent of the future, this PR ensures the error messages match what was documented to be [unsupported](https://nextjs.org/docs/app/building-your-application/deploying/static-exports#unsupported-features). - Documentation: https://github.com/vercel/next.js/pull/53592 - Issue: #48022