엑셀 다운로드 헤더 영역 잡아주는 함수 추가

packages/common/business_components/src/ui/excel/excelStyle.tsx

@@ -53,7 +53,8 @@ export const excelArrayStyle = async (data: ArrayBuffer, range: SheetParameter[]
             if (item.data && item.data.length > 0) {
                 const numCols = item.data[0]?.length || 0;
                 const numRows = item.data.length;
-                const dataRange = workbook.activeSheet(index)?.sheet(index)?.range(`A1:${String.fromCharCode(65 + numCols - 1)}${numRows}`);
+                const lastColLetter = getExcelColumnLetter(numCols);
+                const dataRange = workbook.activeSheet(index)?.sheet(index)?.range(`A1:${lastColLetter}${numRows}`);
                 dataRange?.style((styleQ) => {
                     styleQ.verticalAlignment("center");
                 });
@@ -106,4 +107,16 @@ export const excelStyleWithKoreanHeaders = async (
 
   // 4. 파일 다운로드
   await makeExcelFile(workbook, fileNm);
-};
+};
+
+
+const getExcelColumnLetter = (colIndex: number): string => {
+    let letter = '';
+    while (colIndex > 0) {
+      const mod = (colIndex - 1) % 26;
+      letter = String.fromCharCode(65 + mod) + letter;
+      colIndex = Math.floor((colIndex - 1) / 26);
+    }
+    return letter;
+  };
+