Fix modal label display issues and DOM node removal errors

- Hide rounded background labels in modal (계약구분, 국내/해외, 기본 버튼)
- Add try-catch blocks for DOM operations to prevent removeChild errors
- Fix event listener registration/removal in RealtimePreview, FileUpload, FileComponentConfigPanel
- Improve error handling for CustomEvent dispatching

frontend/components/screen/InteractiveScreenViewerDynamic.tsx

@@ -532,19 +532,11 @@ export const InteractiveScreenViewerDynamic: React.FC<InteractiveScreenViewerPro
   return (
     <>
       <div className="absolute" style={componentStyle}>
-        <div className="h-full w-full rounded-xl border border-gray-200/60 bg-gradient-to-br from-white to-gray-50/30 p-4 shadow-sm transition-all duration-200 hover:shadow-md">
-          {/* 라벨 표시 - 컴포넌트 내부에서 라벨을 처리하므로 외부에서는 표시하지 않음 */}
-          {!hideLabel && component.label && component.style?.labelDisplay === false && (
-            <div className="mb-3">
-              <div className="inline-flex items-center bg-gray-100 px-3 py-1 rounded-lg text-sm font-semibold text-gray-700">
-                {component.label}
-                {(component as WidgetComponent).required && <span className="ml-1 text-orange-500">*</span>}
-              </div>
-            </div>
-          )}
+        <div className="h-full w-full">
+          {/* 라벨 숨김 - 모달에서는 라벨을 표시하지 않음 */}
 
           {/* 위젯 렌더링 */}
-          <div className="flex-1 rounded-lg overflow-hidden">{renderInteractiveWidget(component)}</div>
+          <div className="h-full w-full">{renderInteractiveWidget(component)}</div>
         </div>
       </div>