[feat]: Make a mention of size of slider is not equal to the size of the element in Carousel

[MrOxMasTer]

Feature description

It may be obvious to some that if you use pl-[value], you need to factor that indentation into the slider size as well, i.e. item size + indentation = slider size. Because basically inside the CarouselItem element is some other element, like a product card etc.
But it's just not always obvious. Because of different settings, for example containScroll, align, sometimes it is not clear where and how something should be placed. It makes my head swell if I try to combine it with classes like container from tailwindcss.
For example, I don't know embla-carousel and it's the first time I use it in shadcnui, so this strange behavior was a discovery for me.

--slide-size not equal element size inside the slide.

Affected component/components

https://codesandbox.io/p/sandbox/embla-carousel-default-react-forked-snjtld

Additional Context

Additional details here...

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• I've made research efforts and searched the documentation
• I've searched for existing issues and PRs