feat: add tests

[userquin]

This PR includes:

• update pnpm to 8.5.0 and Nuxt 3.4.3
• build and browser tests for nuxi build and generate

supersedes #35

[userquin]

@danielroe for Nuxt ecosystem-ci:

import { runInRepo } from '../utils'
import { RunOptions } from '../types'

export async function test(options: RunOptions) {
	if (options.viteMajor < 4) {
		// only latest version
		return
	}

	await runInRepo({
		...options,
		repo: 'vite-pwa/nuxt',
		branch: 'userquin/feat-add-tests', // <== change to main when merged
		beforeTest: 'pnpm playwright install',
		build: ['dev:prepare', 'prepack'],
		test: 'test',
	})
}

[dargmuesli]

Why superseding my PR 😄 🥲