fix:상세 모달 닫기 버튼 동작 수정

- data-close-modal 속성을 onclick="closeDetailModal()"로 변경
- X 버튼과 닫기 버튼이 정상적으로 모달을 닫도록 수정

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

resources/views/sales/managers/partials/show-modal.blade.php

@@ -30,7 +30,7 @@
                 </span>
             </div>
         </div>
-        <button type="button" data-close-modal class="text-gray-400 hover:text-gray-600">
+        <button type="button" onclick="closeDetailModal()" class="text-gray-400 hover:text-gray-600">
             <svg class="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                 <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
             </svg>
@@ -277,7 +277,7 @@ class="text-xs text-blue-600 hover:underline">다운로드</a>
 
     <!-- 푸터 버튼 -->
     <div class="mt-6 flex justify-end gap-3">
-        <button type="button" data-close-modal
+        <button type="button" onclick="closeDetailModal()"
                 class="px-4 py-2 border border-gray-300 text-gray-700 rounded-lg hover:bg-gray-50 transition text-sm">
             닫기
         </button>