fix(vite): avoid applying css transform on bundle generation

[equt]

close #1850

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[equt]

Currently, the global mode for the Vite integration will not replace the generated __VITE_PUBLIC_ASSET__hash__ asset URL as I've mentioned in #1850.

And as it turns out, inside the post transformer

unocss/packages/vite/src/modes/global/build.ts

Lines 178 to 180 in d1b72c3

	return await applyCssTransform(layer === LAYER_MARK_ALL
	? result.getLayers(undefined, Array.from(vfsLayers))
	: result.getLayer(layer) || '', `${chunk.fileName}.css`, options.dir)

Only the pre-plugin vite:css from Vite gets called

unocss/packages/vite/src/modes/global/build.ts

Lines 27 to 43 in d1b72c3

	async function applyCssTransform(css: string, id: string, dir: string | undefined) {
	const {
	postcss = true,
	} = await getConfig()
	if (!cssPlugins.get(dir) || !postcss)
	return css
	// @ts-expect-error no this context
	const result = await cssPlugins.get(dir).transform(css, id)
	if (!result)
	return css
	if (typeof result === 'string')
	css = result
	else if (result.code)
	css = result.code
	css = css.replace(/[\n\r]/g, '')
	return css
	}

Since the post-one is missing, we could never turn the __VITE_PUBLIC_ASSET__hash__ back to what it should really be.

This only happens for the global mode, and only for the build rather than the dev.

This PR simply removes the applyCssTransform, as I don't see any necessary reason why it should be performed upon a generated chunk.