chore: replace prettier with oxfmt

[teemingc]

Inspired by sveltejs/svelte#18538 , this aims for a one-to-one migration of the current config; it doesn’t enable additonal features like jsdoc formatting, import sorting, etc.

[pkg-svelte-dev]

Install the latest version of @sveltejs/kit from acd4199:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/acd4199f5ce8e6a4eaad6c4986d020bddcaf2e3c

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16702

[changeset-bot]

⚠️ No Changeset found

Latest commit: acd4199

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-16702-svelte.vercel.app/

[teemingc]

/autofix