## What kind of change does this PR introduce?
Add `Markdown` component
- as a ui-pattern
- docs in design-system
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Introduced a Markdown UI pattern with full documentation and a docs
sidebar entry.
* Markdown component supports composable renderers, optional lazy syntax
highlighting, and customizable element overrides.
* Added many interactive examples (full demo, headings, paragraphs,
lists, links, inline code, blockquotes, code blocks, tables, images,
horizontal rules) plus Quote and Avatar demos.
* **Documentation**
* New MDX guide detailing usage, props, and customization previews.
<!-- review_stack_entry_start -->
[](https://app.coderabbit.ai/change-stack/supabase/supabase/pull/46325?utm_source=github_walkthrough&utm_medium=github&utm_campaign=change_stack)
<!-- review_stack_entry_end -->
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
- Most changes are related to either types or `useRef` usages (it now
requires an initial value).
- also updated `vaul` to its latest version and haven't noticed any
change ([design-system
demo](https://design-system-git-react-19-supabase.vercel.app/design-system/docs/components/drawer))
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Upgraded workspace to React 19.
* **Bug Fixes**
* Improved null-safety and ref handling across editors, UI components,
shortcuts, and markdown/image rendering to reduce runtime errors.
* Safer event/timeout/interval cleanup and more robust command/context
handling.
* **Chores**
* Bumped vaul dependency versions.
* **Documentation**
* Type and TypeScript accuracy improvements for clearer developer
feedback.
<!-- review_stack_entry_start -->
[](https://app.coderabbit.ai/change-stack/supabase/supabase/pull/45886)
<!-- review_stack_entry_end -->
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Sorted all imports in all packages, `cms`, `design-system` and
`ui-library` apps by running `pnpm format` on them.
All changes in this PR are done by the script.
* Remove extra file.
* Remove unneeded tsconfig.jsons.
* Add @/* alias for importing in-package files to all apps.
* Remove baseUrl from all apps except studio (it'll require changes in almost all files).
* Fix baseUrl issues in docs, ui-library and design-system.
* Fix the typecheck for cms app. Fix all baseUrl errors in the cms app.
* Add deprecated flag to baseUrl in www.
* Add all missing libraries in the packages/apps.
* Add all missing Vitest imports to the tests.
* Add some missing exports to ui.
* Fix the admonition export.
* Fix various minor bugs.
* Migrate the ui package to use vitest.
Francesco Sansalvadore
