파일 이름 변경 내용에 접미사 추가

src/renderer/grid.js

@@ -11,6 +11,7 @@ const fileCount     = document.getElementById('file-count');
 const selCount      = document.getElementById('sel-count');
 const inputPrefix   = document.getElementById('input-prefix');
 const inputDigits   = document.getElementById('input-digits');
+const inputPostfix  = document.getElementById('input-postfix');
 
 let _cardObserver = null;
 
@@ -111,7 +112,7 @@ export function updateNumberBadges() {
 }
 
 export function updateNewNameLabels() {
-  const format = getNameFormat(inputPrefix, inputDigits);
+  const format = getNameFormat(inputPrefix, inputDigits, 3, inputPostfix);
   Array.from(grid.children).forEach((card, i) => {
     const el   = card.querySelector('.card-new-name');
     const file = state.files[i];