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,

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[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 👍