refactor: Improve V2Repeater integration and event handling

- Updated the EditModal component to check for registered V2Repeater instances before saving detail data, enhancing the reliability of the repeater save process.
- Simplified the V2Repeater component by removing unnecessary groupedData handling, ensuring it manages its own data effectively.
- Enhanced the DynamicComponentRenderer to correctly handle V2Repeater's data management, improving overall component behavior.
- Refactored button actions to wait for V2Repeater save completion only when active repeaters are present, optimizing performance and user experience.

frontend/lib/registry/DynamicComponentRenderer.tsx

@@ -546,10 +546,12 @@ export const DynamicComponentRenderer: React.FC<DynamicComponentRendererProps> =
         let currentValue;
         if (componentType === "modal-repeater-table" || 
             componentType === "repeat-screen-modal" ||
-            componentType === "selected-items-detail-input" ||
-            componentType === "v2-repeater") {
+            componentType === "selected-items-detail-input") {
           // EditModal/ScreenModal에서 전달된 groupedData가 있으면 우선 사용
           currentValue = props.groupedData || formData?.[fieldName] || [];
+        } else if (componentType === "v2-repeater") {
+          // V2Repeater는 자체 데이터 관리 (groupedData는 메인 테이블 레코드이므로 사용하지 않음)
+          currentValue = formData?.[fieldName] || [];
         } else {
           currentValue = formData?.[fieldName] || "";
         }