supabase / supabase / 27042353318

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fix(docs) Resolve React Router auth setup errors and confusion (#46684)

Fixes DOCS-651

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

This adds a non-null assertion to a Supabase method that expects
non-null.
Additionally, it updates a label from 'Remix' to 'React Router'.


## What is the current behavior?

Two issues: 
- Following the Auth client steps with React Router creates a
`deprecation` error and downstream Typescript errors.
- 'Remix' is renamed to 'React Router'.
> Remix and React Router are the same thing, made by the same people.
Remix was simply renamed React Router Framework Mode starting in version
7 of React Router.
- [Blog
Source](https://reacttraining.com/blog/remix-vs-react-router-framework)

<img width="894" height="754" alt="Screenshot 2026-06-04 at 4 00 45 PM"
src="https://github.com/user-attachments/assets/33dc5d89-4a76-44b6-a5c3-39a30dca3b57"
/>


<img width="604" height="464" alt="Screenshot 2026-06-05 at 11 21 54 AM"
src="https://github.com/user-attachments/assets/10ea458f-22e5-498c-b43a-df13f7902a17"
/>

## What is the new behavior?

- Adding a non-null assertion clears up all error. Running the
application does not produce errors.
- Changing the label from "Remix" to "React Router" updates the dropdown
name to match the rebrand. Now, it does not look outdated and matches
the docs.

<img width="609" height="519" alt="Screenshot 2026-06-05 at 11 22 48 AM"
src="https://github.com/user-attachments/assets/c18ee5b7-4693-40c9-9c20-8f95756c8298"
/>




## Additional context

The task was to clarify our documentation on this page: [Create a
Client](https://supabase.com/docs/guides/auth/server-side/creating-a-client?queryGroups=framework&framework=react-router&queryGroups=environment&environment=react-router-loader#create-a-client)

However, the code sample in the docs is correct; the documentation in
**Dashboard** p... (continued)

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