Support Vite v5.1.0's .css?url imports

[markdalgleish]

Fixes #7786

This adds built in support for .css?url imports in Vite v5.1.0 (currently in beta) to ease migration of Remix's regular CSS imports.

-import styles from "~/styles/dashboard.css";
+import styles from "~/styles/dashboard.css?url";

The only thing we need to do to support this out of the box is to enable build.cssMinify in server builds by default. If we don't do this, content hashes differ between server and client since the server doesn't have minification enabled by default.

I've opted to call out the beta status of this feature rather than waiting for Vite 5.1.0 so that it doesn't need to be a blocker for a stable release of the Remix Vite plugin.

We had an existing test for Vite v5.0.x's .css?url imports but it didn't use any CSS processing. In order to exercise the new .css?url support in Vite v5.1.0, I've updated our dev dependency to v5.1.0-beta.6 and modified the test case to use a minimal PostCSS plugin (copied from the Remix compiler's PostCSS tests) so that CSS processing is required for the test to pass. I've confirmed that the updated test fails when using Vite v5.0.x.

[changeset-bot]

🦋 Changeset detected

Latest commit: cef9525

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

This PR includes changesets to release 16 packages

Name	Type
@remix-run/dev	Patch
create-remix	Patch
remix	Patch
@remix-run/architect	Patch
@remix-run/cloudflare	Patch
@remix-run/cloudflare-pages	Patch
@remix-run/cloudflare-workers	Patch
@remix-run/css-bundle	Patch
@remix-run/deno	Patch
@remix-run/eslint-config	Patch
@remix-run/express	Patch
@remix-run/node	Patch
@remix-run/react	Patch
@remix-run/serve	Patch
@remix-run/server-runtime	Patch
@remix-run/testing	Patch

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[github-actions]

🤖 Hello there,

We just published version 2.7.0-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 2.7.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!