fix: stabilize federated-css e2e

[ScriptedAlchemy]

Summary

• add a shared ensureNmdPolyfill helper and import it across all expose and consumer entrypoints so webpack_require.nmd is defined before lazy imports execute
• update Next.js federation configs/scripts to load the helper, share react-dom, and expose the remote page re-exports
• fix css module handling by enabling modules/esModule in the remote configs and normalizing default exports in the components
• remove the obsolete run-all Playwright spec that conflicted with per-project runs

Testing

• pnpm run e2e:ci

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https://chatgpt.com/codex/tasks/task_e_68ce505b230c83258b22c459c302404a