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

This reverts commit 63012618a2, reversing
changes made to 6573981505.

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

@@ -13,14 +13,12 @@ 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 (
@@ -39,10 +37,7 @@ export function DatePicker({
           )}
         </Button>
       </PopoverTrigger>
-      <PopoverContent
-        className="w-auto p-0"
-        style={{ zIndex: zIndex || 'auto' }}
-      >
+      <PopoverContent className="w-auto p-0">
         <Calendar classNames={{ cell: "rounded-md" }} {...props} />
       </PopoverContent>
     </Popover>