Revert "feat: DatePickerRange에 z-index props 추가"

This reverts commit b75caf4f7b.

packages/common/business_components/src/ui/date_picker_range/index.tsx

@@ -12,14 +12,12 @@ import { Popover, PopoverContent, PopoverTrigger } from "@common/components/ui";
 type DatePickerRangeProps = {
   placeholder?: string;
   disabled?: boolean | ((date: Date) => boolean);
-  zIndex?: number; // z-index prop 추가
 } & DayPickerSingleProps;
 
 export function DatePickerRange({
   className,
   placeholder = "날짜 선택",
   disabled,
-  zIndex,
   ...props
 }: DatePickerRangeProps) {
   return (
@@ -38,8 +36,8 @@ export function DatePickerRange({
           )}
         </Button>
       </PopoverTrigger>
-      <PopoverContent className={cn("w-auto p-0", zIndex ? `!z-[${zIndex}]` : "")}>
-        <Calendar initialFocus classNames={{ cell: "rounded-md" }} {...props}
+      <PopoverContent className="w-auto p-0">
+        <Calendar initialFocus classNames={{ cell: "rounded-md" }} {...props} 
           disabled={typeof disabled === "function" ? disabled : undefined}
         />
       </PopoverContent>