next.js

d6195eca - Fix layout segment optimization: move app-page imports to server-utility transition (#91701)

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