Update index.html

index.html

@@ -55,6 +55,7 @@
           <div class="control-group" id="layers-panel">
               <h3>레이어 목록</h3>
               <div class="layer-option">
+                  <button id="delete-layer-btn" class="danger-btn" disabled>선택 레이어 삭제</button>
               </div>
               <div id="layers-list" class="layers-list">
             </div>