feat: Add image thumbnail rendering in SplitPanelLayoutComponent

- Introduced SplitPanelCellImage component to handle image rendering for table cells, supporting both object IDs and file paths.
- Enhanced formatCellValue function to display image thumbnails for columns with input type "image".
- Updated column input types loading logic to accommodate special rendering for images in the right panel.
- Improved error handling for image loading failures, ensuring a better user experience when images cannot be displayed.

frontend/components/v2/config-panels/V2SelectConfigPanel.tsx

@@ -302,6 +302,15 @@ export const V2SelectConfigPanel: React.FC<V2SelectConfigPanelProps> = ({ config
               테이블 컬럼을 조회할 수 없습니다. 테이블 타입 관리에서 참조 테이블을 설정해주세요.
             </p>
           )}
+
+          {/* 자동 채움 안내 */}
+          {config.entityTable && entityColumns.length > 0 && (
+            <div className="border-t pt-3">
+              <p className="text-muted-foreground text-[10px]">
+                같은 폼에 참조 테이블({config.entityTable})의 컬럼이 배치되어 있으면, 엔티티 선택 시 해당 필드가 자동으로 채워집니다.
+              </p>
+            </div>
+          )}
         </div>
       )}