Macros: write the macro names into xlsx again after the main merge

The merge with main kept main's xlsx line in save_bytes_as, which dropped
macros::with_names, so an xlsx save carried no macros.

crates/engine/src/io.rs

@@ -249,8 +249,10 @@ pub fn save_bytes_as(wb: &Workbook, path: &str, kind: FileKind) -> Result<Vec<u8
         // the VBA project, so any other name saves without it, as Excel does.
         // Macros travel in hidden names.
         FileKind::Xlsx => {
+            let named = crate::macros::with_names(wb)?;
             let book = std::path::Path::new(path).file_name().and_then(std::ffi::OsStr::to_str).unwrap_or_default();
-            gridcraft_xlsx::write_xlsx_named(wb, gridcraft_xlsx::XlsxKind::from_path(path), book).map_err(|e| EngineError::Other(e.to_string()))
+            gridcraft_xlsx::write_xlsx_named(named.as_ref().unwrap_or(wb), gridcraft_xlsx::XlsxKind::from_path(path), book)
+                .map_err(|e| EngineError::Other(e.to_string()))
         }
         FileKind::Xls => {
             Err(EngineError::Other("Excel 97-2003 (.xls) is supported for import only. Save as .xlsx or another supported export format.".into()))