fix(Calendar): grey out days outside of displayed month (#3639)

Author: ac-shadow

src/theme/calendar.ts

@@ -12,7 +12,7 @@ export default (options: Required<ModuleOptions>) => ({
     gridBody: 'grid',
     headCell: 'rounded-[calc(var(--ui-radius)*1.5)]',
     cell: 'relative text-center',
-    cellTrigger: ['m-0.5 relative flex items-center justify-center rounded-full whitespace-nowrap focus-visible:ring-2 focus:outline-none data-disabled:text-(--ui-text-muted) data-unavailable:line-through data-unavailable:text-(--ui-text-muted) data-unavailable:pointer-events-none data-[selected]:text-(--ui-bg) data-today:font-semibold', options.theme.transitions && 'transition']
+    cellTrigger: ['m-0.5 relative flex items-center justify-center rounded-full whitespace-nowrap focus-visible:ring-2 focus:outline-none data-disabled:text-(--ui-text-muted) data-unavailable:line-through data-unavailable:text-(--ui-text-muted) data-unavailable:pointer-events-none data-[selected]:text-(--ui-bg) data-today:font-semibold data-[outside-view]:text-(--ui-text-muted)', options.theme.transitions && 'transition']
   },
   variants: {
     color: {