Reapply "Merge branch 'iipbs/sn/ii' into iipbs/sn/main"

This reverts commit 2aa202ace3.

packages/common/components/src/ui/date-picker/index.tsx

@@ -13,12 +13,14 @@ type DatePickerProps = {
   placeholder?: string;
   disabled?: boolean;
   selected?: Date;
+  zIndex?: number; // z-index prop 추가
 } & React.ComponentProps<typeof DayPicker>;
 
 export function DatePicker({
   className,
   placeholder = "날짜 선택",
   disabled,
+  zIndex, // zIndex prop 받기
   ...props
 }: DatePickerProps) {
   return (
@@ -37,7 +39,10 @@ export function DatePicker({
           )}
         </Button>
       </PopoverTrigger>
-      <PopoverContent className="w-auto p-0">
+      <PopoverContent
+        className="w-auto p-0"
+        style={{ zIndex: zIndex || 'auto' }}
+      >
         <Calendar classNames={{ cell: "rounded-md" }} {...props} />
       </PopoverContent>
     </Popover>