st: refactor: editable: false 항목 cell 스타일 적용 방식 수정

apps/st/src/components/module/DataGrid.tsx

@@ -1171,7 +1171,7 @@ const DataGrid = ({
                                 const gv = gridRef.current?.gridView;
                                 if (!gv?.columnByName) return;
                                 columns.forEach((column) => {
-                                    const baseStyleName = column.styleName ?? (column.editable === false ? 'rg-cell-readonly' : undefined);
+                                    const baseStyleName = column.styleName;
                                     const gridCol = gv.columnByName(column.name) as { styleCallback?: (g: unknown, dataCell: { itemIndex?: number; index?: { itemIndex?: number }; dataField?: string; fieldName?: string }) => string } | null;
                                     if (gridCol) {
                                         gridCol.styleCallback = (_g, dataCell) => {
@@ -1191,12 +1191,7 @@ const DataGrid = ({
                         }}
                     >
                     {columns.map((column) => {
-                        const baseStyleName =
-                            column.styleName != null
-                                ? column.styleName
-                                : column.editable === false
-                                    ? ('rg-cell-readonly' as const)
-                                    : undefined;
+                        const baseStyleName = column.styleName;
 
                         return (
                             <RGDataColumn