## Problem
We want to upgrade to react 19. However some libraries aren't compatible
with it. Besides, `next-mdx-remote` is now archived and not maintained
anymore.
## Solution
The [NextJS
documentation)[https://nextjs.org/docs/15/app/guides/mdx#remote-mdx]
suggest using
[`next-mdx-remote-client`](https://github.com/ipikuka/next-mdx-remote-client)
which was a fork of `next-mdx-remote`.
- [x] migrate `apps/www` from `next-mdx-remote` to
`next-mdx-remote-client`
- [x] migrate `apps/www` from `next-mdx-remote` to
`next-mdx-remote-client`
I haven't noticed any change in the pages.
When upgrading to react 19, we'll have to use v2 of
`next-mdx-remote-client`.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Switched MDX rendering/serialization to a newer client-focused
implementation across docs and site for improved compatibility.
* **Bug Fixes**
* Improved handling of serialization errors so MDX failures render clear
fallback messages instead of breaking pages.
* **Chores**
* Updated local environment template value for the public anonymous key.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## I have read the CONTRIBUTING.md file.
YES
## What kind of change does this PR introduce?
Dependency upgrade (next-mdx-remote v4 → v6)
## What is the current behavior?
The docs app uses next-mdx-remote v4.4.1 with MDX v2.
## What is the new behavior?
- Upgraded to next-mdx-remote v6.0.0 (uses MDX v3)
- Updated @mdx-js/loader and @mdx-js/react to v3
- Upgraded remark-gfm to v4 for MDX v3 compatibility
- Removed deprecated `useDynamicImport` option (now default)
- Added `blockJS: false` to preserve JS expressions in MDX content
Build compiles successfully. Testing shows the same pre-existing
prerender error on /guides/troubleshooting as on master (supabaseUrl is
required).
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Chores**
* Upgraded MDX and markdown tooling to major releases (MDX v3,
next-mdx-remote v6, remark-gfm v4).
* Adjusted MDX serialization to disable embedded JS handling and remove
legacy dynamic-import behavior for more consistent rendering of docs,
guides, and code examples.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Claude Haiku 4.5 <noreply@anthropic.com>
strictNullChecks was off for docs, which lets errors slip through and
leads to incorrect required/optional typing on Zod-inferred types. This
PR enables strictNullChecks and fixes all the existing violations.
* exclude dart, python, and swift from error codes menu
* Update the error code doc to be client lib agnostic
* run formatter
* Add a filter to filter out section items
* Update apps/docs/components/Navigation/NavigationMenu/NavigationMenuRefList.tsx
* docs: move error codes table in a separate component
* Add auth error codes section for kotlin
