refactor: text value 컨벤션에 맞게 수정

src/components/Playground.jsx

@@ -130,10 +130,10 @@ export default function Playground() {
       <div className="container mx-auto p-4 m-4 border">
         <div className={styles.test}>이 영역은 테스트입니다.</div>
         <div>
-          <QInput type={'text'} value={textInput} onChange={setTextInput} />
-          <QInput type={'text'} value={textInput} onChange={setTextInput} readOnly={true} />
+          <QInput type='text' value={textInput} onChange={setTextInput} />
+          <QInput type='text' value={textInput} onChange={setTextInput} readOnly={true} />
           <QInput
-            type={'radio'}
+            type='radio'
             value={radioInput}
             onChange={setRadioInput}
             options={[
@@ -142,7 +142,7 @@ export default function Playground() {
             ]}
           />
           <QInput
-            type={'checkbox'}
+            type='checkbox'
             value={checkboxInput}
             onChange={setCheckboxInput}
             options={[