feat: button, calendar, datePicker, input, pagination, icons 추가

web-app/app/shared/components/calendar/utils.ts

@@ -0,0 +1,13 @@
+import { CalendarDate, type DateValue, fromDate, toCalendarDate } from '@internationalized/date';
+
+const TIMEZONE = 'Asia/Seoul';
+
+export function dateToCalendarDate(date: Date | null): CalendarDate | null {
+  if (!date) return null;
+  return toCalendarDate(fromDate(date, TIMEZONE));
+}
+
+export function calendarDateToDate(value: DateValue | null): Date | null {
+  if (!value) return null;
+  return value.toDate(TIMEZONE);
+}