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## Summary - `contentlayer2@0.4.6` is unmaintained and drags in a heavy, stale dependency graph (esbuild pinned to 0.17–0.20, mdx-bundler, old `@opentelemetry/core`) that was the recurring source of vuln bumps. - Migrates all three apps that used it — `design-system`, `ui-library`, `learn` — to [Velite](https://velite.js.org), preserving the generated typed `allDocs`/`Doc` collection and the `body.code` + `useMDXComponent` runtime via a small shared local hook. - Same MDX pipeline (remark-gfm, remark-code-import, rehype-slug, rehype-pretty-code w/ Shiki compat + local theme, rehype-autolink-headings, custom `__rawString__`/`__src__`/`__event__`/`__style__` visitors) ported 1:1 into each app's `velite.config.js`. - `learn`'s extra frontmatter fields (`chapterNumber`, `explore`, `courseHero`) are now backed by real Velite/Zod schema types, so the `(doc as any)` casts in `get-next-page.ts` / `get-current-chapter.ts` / the doc page could be dropped. - `next.config.mjs` no longer wraps with `withContentlayer`; since Velite has no Next.js webpack-plugin equivalent, each app's `dev` script now runs `velite dev` and `next dev` in parallel via `npm-run-all`. Ref: [FE-3861](https://linear.app/supabase/issue/FE-3861/migrate-off-contentlayer2-learn-ui-library-design-system-to-shed) ## Test plan - [x] `pnpm build:content` (Velite build) succeeds for all three apps - [x] `pnpm typecheck` passes for all three apps - [ ] Manual smoke test of `pnpm dev` for each app in a browser (docs pages render, TOC, copy-button, code highlighting) <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Improvements** * Improved content generation across documentation, learning materials, and the UI library for more consistent pages. * Preserved MDX rendering, navigation, table of contents, course metadata, source previews, and component examples. * Improved consistency when displaying documentation and interactive examples. * Improved application loading by optimizing how interface components are delivered. * **Chores** * Streamlined content compilation and development workflows across the design system, learning area, and UI library. <!-- end of auto-generated comment: release notes by coderabbit.ai -->