파일 이름 변경 내용에 접미사 추가

src/renderer/utils/file-names.js

@@ -7,14 +7,17 @@ export function clampDigits(value, fallback = 3) {
   return Math.max(1, Math.min(6, parseInt(value, 10) || fallback));
 }
 
-export function buildSequentialName(fileName, index, { prefix, digits }) {
+export function buildSequentialName(fileName, index, { prefix, digits, postfix = '' }) {
   const ext = getExtension(fileName);
-  return `${prefix}_${String(index + 1).padStart(digits, '0')}.${ext}`;
+  const sequence = `${prefix}_${String(index + 1).padStart(digits, '0')}`;
+  const suffix = postfix ? `_${postfix}` : '';
+  return `${sequence}${suffix}.${ext}`;
 }
 
-export function getNameFormat(prefixInput, digitsInput, digitsFallback = 3) {
+export function getNameFormat(prefixInput, digitsInput, digitsFallback = 3, postfixInput = null) {
   return {
     prefix: prefixInput.value.trim() || 'photo',
     digits: clampDigits(digitsInput.value, digitsFallback),
+    postfix: postfixInput?.value.trim() || '',
   };
 }