feat: use ?inline to load critical styles

[sapphi-red]

The default export of css files was removed in Vite v5, but it was accidently left for SSR. Vite v6 removes that (vitejs/vite#17922). This PR changes the critical style loader to use ?inline imports to make remix compatible with Vite v6.

Testing Strategy: I ran pnpm i && pnpm vite-ecosystem-ci:build && pnpm vite-ecosystem-ci:test with both Vite 5.x and 6.x.

[remix-cla-bot]

Hi @sapphi-red,

Welcome, and thank you for contributing to Remix!

Before we consider your pull request, we ask that you sign our Contributor License Agreement (CLA). We require this only once.

You may review the CLA and sign it by adding your name to contributors.yml.

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- The Remix team

[changeset-bot]

🦋 Changeset detected

Latest commit: dad7725

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 19 packages

Name	Type
@remix-run/dev	Minor
@remix-run/fs-routes	Minor
@remix-run/route-config	Minor
@remix-run/routes-option-adapter	Minor
create-remix	Minor
remix	Minor
@remix-run/architect	Minor
@remix-run/cloudflare	Minor
@remix-run/cloudflare-pages	Minor
@remix-run/cloudflare-workers	Minor
@remix-run/css-bundle	Minor
@remix-run/deno	Minor
@remix-run/eslint-config	Minor
@remix-run/express	Minor
@remix-run/node	Minor
@remix-run/react	Minor
@remix-run/serve	Minor
@remix-run/server-runtime	Minor
@remix-run/testing	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[markdalgleish]

Thanks for the PR! Could you point this at the dev branch instead, and add a changeset?

[sapphi-red]

Sure. I pointed to the dev branch and added a changeset 👍

[github-actions]

Thank you for opening this pull request, and our apologies we haven't gotten around to it yet!

With the release of React Router v7 we are sun-setting continued development/maintenance on Remix v2. If you have not already upgraded to React Router v7, we recommend you do so. We've tried to make the upgrade process as smooth as possible with our Future Flags. We are now in the process of cleaning up outdated issues and pull requests to improve the overall hygiene of our repositories.

We plan to continue to address 2 types of issues in Remix v2:

• Bugs that pose security concerns
• Bugs that prevent upgrading to React Router v7

If you believe this pull request meets one of those criteria, please respond or create a new pull request so it pops up on our radar (since github notifications may get lost in the noise 😕).

For all other issues/changes, ongoing maintenance will be happening in React Router v7, so:

• If this is a bug fix, please reopen against React Router v7
• If this is a new feature, please open a new Proposal Discussion in React Router, and if it gets enough community support it can be considered for implementation

If you have any questions you can always reach out on Discord. Thanks again for providing feedback and helping us make our framework even better!