fix: calendar max-width on Themes

[Lakelimbo]

Closes: #660

The card with the Calendar (with max-w-[260px]) caused the buttons inside the component to overflow (more noticeable with the Default theme). Changing to max-w-[280px] fixes it (and syncs with the original shadcn/ui)

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Name	Status	Preview	Comments	Updated (UTC)
shadcn-svelte	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 20, 2024 6:16pm

[huntabyte]

Thanks!