[폴더 열기], [이름 변경 실행] 버튼 단축키 추가

src/renderer/index.html

@@ -13,14 +13,14 @@
 </div>
 
 <div id="toolbar">
-  <button class="btn btn-primary" id="btn-open">📁 폴더 열기</button>
+  <button class="btn btn-primary" id="btn-open"><span>📁</span>폴더 열기 (O)</button>
   <div class="separator"></div>
   <div class="sort-group">
     <button class="sort-btn" id="btn-sort-name">이름순</button>
     <button class="sort-btn" id="btn-sort-date">날짜순</button>
   </div>
   <div class="separator"></div>
-  <button class="btn btn-success" id="btn-rename" disabled>✅ 이름 변경 실행</button>
+  <button class="btn btn-success" id="btn-rename" disabled><span>✅</span>이름 변경 실행 (S)</button>
   <div style="margin-left:auto; display:flex; align-items:center; gap:8px;">
     <span class="dir-path" id="dir-path">폴더를 선택하세요</span>
     <button class="btn btn-ghost" id="btn-reveal" disabled>Finder에서 열기</button>