refactor: QSelect 컴포넌트 내 placeholder 옵셔널 처리로 수정

src/components/Playground.jsx

@@ -195,7 +195,7 @@ export default function Playground() {
           <QSelect
             value={selectedValue}
             onChange={setSelectedValue}
-            placeholder="동물을 선택하세요"
+            // placeholder="동물을 선택하세요"
             options={[
               { id: 's01', value: 'cat', name: '고양이' },
               { id: 's02', value: 'dog', name: '개' },

src/components/common/select/QSelect.jsx

@@ -2,7 +2,7 @@
 
 import { useCallback } from 'react'
 
-export default function QSelect({ placeholder = '', options, disabled = false, dark = false, value, onChange }) {
+export default function QSelect({ placeholder, options, disabled = false, dark = false, value, onChange }) {
   // const options = [
   //   { id: 's01', value: 'cat', name: '고양이' },
   //   { id: 's02', value: 'dog', name: '개' },
@@ -23,9 +23,11 @@ export default function QSelect({ placeholder = '', options, disabled = false, d
         <div className="form-input">
           <div className="mb5">
             <select className={`select-light ${dark ? 'dark' : ''}`} value={value} onChange={handleChange} disabled={disabled ? true : false}>
+              {placeholder?.length > 0 ? (
                 <option value="" disabled hidden>
                   {placeholder}
                 </option>
+              ) : null}
               {options.map((option) => (
                 <option key={option.name} value={option.value}>
                   {option.name}