Merge pull request #33389 from backstage/rugvip/nfs-header-page-migration

plugins: migrate NFS pages to HeaderPage

.changeset/live-nav-rest-items.md

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+---
+'@backstage/plugin-app': patch
+'@backstage/plugin-app-react': patch
+---
+
+`NavContentBlueprint` nav item collections now keep previously collected `rest()` results in sync when additional items are taken later in the same render, making it easier to place items across multiple sidebar sections.

.changeset/nfs-header-foundations.md

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+---
+'@backstage/frontend-plugin-api': patch
+'@backstage/plugin-app': patch
+'@backstage/ui': patch
+---
+
+Pages created with `PageBlueprint` now render the plugin header by default in the new frontend system.

.changeset/nfs-header-page-migrations.md

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+---
+'@backstage/plugin-api-docs': patch
+'@backstage/plugin-auth': patch
+'@backstage/plugin-catalog': patch
+'@backstage/plugin-catalog-unprocessed-entities': patch
+'@backstage/plugin-devtools': patch
+'@backstage/plugin-notifications': patch
+'@backstage/plugin-search': patch
+'@backstage/plugin-user-settings': patch
+---
+
+New frontend system pages now use the default plugin header together with `HeaderPage` instead of the legacy core page header pattern.

.changeset/remove-devtools-content-blueprint.md

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+---
+'@backstage/plugin-catalog-unprocessed-entities': patch
+'@backstage/plugin-devtools': patch
+'@backstage/plugin-devtools-react': minor
+---
+
+Removed the deprecated `DevToolsContentBlueprint` from `@backstage/plugin-devtools-react`. DevTools pages in the new frontend system now use `SubPageBlueprint` tabs instead, and the catalog unprocessed entities alpha extension now attaches to DevTools as a subpage.