Tobias KoppersandGitHub 6a8a31a7f4 Fix layout segment optimization: move app-page imports to server-utility transition (#91701)
## Summary

- Add `'turbopack-transition': 'next-server-utility'` to all server-side imports in the `app-page.ts` template so they are properly placed in the server utility layer, rather than relying on `SharedMerged` chunk groups to handle them
- Remove the now-unnecessary `next-server-utility` transition from `fillMetadataSegment` import in `app_page_loader_tree.rs`
- Add `SharedMultiple` chunk group variant to support multiple shared entries without a merge tag
  - This avoid passing the `parent` into `SharedMerged`, which did break the layout segment optimization.
- Refactor `app_module_graphs` to combine `client_shared_entries` + `has_layout_segments` into a single `Option` parameter, simplifying the API and removing the dead code path for non-page endpoints

## Test plan

- [ ] Verify dev and production builds work with app pages that have layout segments
- [ ] Verify route handlers still build correctly (no client runtime entries passed)
- [ ] Run existing app-dir e2e tests
2026-03-20 13:00:43 +01:00
2025-10-13 10:43:51 +02:00
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2026-03-19 21:31:11 +00:00
2026-03-19 21:31:11 +00:00
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