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Reproduce nextjs-client-node-browser-variants from its authentic engineer request.

Reproduce nextjs-client-node-browser-variants from its authentic engineer request.: a task in nextjs-selfbench (Harbor dataset). Split the remaining “client-node”-only modules into .browser variants. Resolve all recent regressions that introduce next/src/server into client-browser bundles…

The task

Split the remaining “client-node”-only modules into `.browser` variants. Resolve all recent regressions that introduce `next/src/server` into client-browser bundles. Client-browser bundles must contain no `next/src/server` modules, while existing client-node behavior must remain unchanged.

Part of dari-ai/nextjs-selfbench.