feat: add Vite 8 support

[markdalgleish]

This adds Vite 8 to our peer dep range for @react-router/dev, removes our temporary rolldown-vite support and fixes, updates our Vite plugin to provide the correct config for oxc/Rolldown, and updates tests/playgrounds.

Vite 8 is now our new default when version numbers are not specified, and I've added some Vite 6 playgrounds for consistency with the other versioned templates.

[changeset-bot]

🦋 Changeset detected

Latest commit: 5c3ccef

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

This PR includes changesets to release 11 packages

Name	Type
@react-router/dev	Major
@react-router/fs-routes	Major
@react-router/remix-routes-option-adapter	Major
create-react-router	Major
react-router	Major
react-router-dom	Major
@react-router/architect	Major
@react-router/cloudflare	Major
@react-router/express	Major
@react-router/node	Major
@react-router/serve	Major

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[luisrudge]

will this fix this warning?

[vite] warning: `esbuild` option was specified by "react-router" plugin. This option is deprecated, please use `oxc` instead.

[markdalgleish]

@luisrudge Yep, it'll fix that.

[github-actions]

🤖 Hello there,

We just published version 7.14.0-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 7.14.0 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!

[AviVahl]

@markdalgleish even with this change, vite@7 is still gets installed downstream due to @react-router/dev depending on an older vite-node major.

[tobigumo]

There's a PR to replace vite-node with Vite's native Environment API, but that API only exists in Vite 6+, so it would require dropping Vite 5 support. Would that be on the table?

[vixalien]

As said author of PR #14862 it would be nice to have any feedback or review (esp. from react router team)