feat(MonthCalendar ): add MonthCalendar component

[floriskn]

This PR adds support for the MonthCalendar variant. I needed something like this for a project I was working on, so I put together a quick initial version to explore the idea.

I wasn’t sure if something like this would even be considered for inclusion, but I figured it was worth making and sharing to show what it could look like. It’s a bit rough and was done fairly quickly, so it might need some iteration — happy to refine things if there’s interest.

The structure is loosely inspired by this example: shadcn-ui-monthpicker, though adapted to fit more closely with the existing calendar patterns in the library.

That said, I think it fits nicely alongside the existing calendar types and could be useful in other projects too.

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