fix: svelte unsafe mutation

Author: segunadebayo

.changeset/famous-candles-visit.md

@@ -0,0 +1,5 @@
+---
+"@zag-js/date-picker": patch
+---
+
+Fix issue where Svelte throws a `state_unsafe_mutation` error when controlling the datepicker range mode.

packages/machines/date-picker/src/date-picker.utils.ts

@@ -15,7 +15,7 @@ export function isDateWithinRange(date: DateValue, value: (DateValue | null)[])
 }
 
 export function sortDates(values: DateValue[]) {
-  return values.sort((a, b) => a.compare(b))
+  return values.slice().sort((a, b) => a.compare(b))
 }
 
 export function getRoleDescription(view: DateView) {