Fix runtime behavior to match the type definition

[andjsrk]

Currently, the definition of ClassNames is recursive:

vanilla-extract/packages/css/src/types.ts

Line 166 in 221f07f

export type ClassNames = string | Array<ClassNames>;

But it is not handled correctly on:

vanilla-extract/packages/css/src/style.ts

Lines 30 to 36 in 221f07f

	for (const rule of rules) {
	if (typeof rule === 'string') {
	classList.push(rule);
	} else {
	styleRules.push(rule);
	}
	}

This PR fixes this mismatch.

[changeset-bot]

🦋 Changeset detected

Latest commit: a95d74b

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

This PR includes changesets to release 10 packages

Name	Type
@vanilla-extract/css	Patch
@vanilla-extract/compiler	Patch
@vanilla-extract/integration	Patch
@vanilla-extract/rollup-plugin	Patch
@vanilla-extract/vite-plugin	Patch
@vanilla-extract/esbuild-plugin	Patch
@vanilla-extract/jest-transform	Patch
@vanilla-extract/parcel-transformer	Patch
@vanilla-extract/webpack-plugin	Patch
@vanilla-extract/next-plugin	Patch

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