Preserve QExcell worksheet zoom in XLSX

src/io/excellOffice.test.ts

@@ -29,6 +29,7 @@ import {
   worksheetXmlToRowHeights,
   worksheetXmlToShowGridLines,
   worksheetXmlToTabColor,
+  worksheetXmlToZoomScale,
   xlsxStylesXmlToCellFormatTable,
   xlsxThemeXmlToColors,
   xlsxCellToText
@@ -688,6 +689,52 @@ describe("excellOffice OOXML helpers", () => {
     expect(imported.sheets[0].showGridLines).toBe(false);
   });
 
+  it("читает и записывает масштаб листа XLSX через sheetView zoomScale", async () => {
+    expect(
+      worksheetXmlToZoomScale({
+        worksheet: {
+          sheetViews: {
+            sheetView: { zoomScale: "125" }
+          }
+        }
+      })
+    ).toBe(125);
+    expect(
+      worksheetXmlToZoomScale({
+        worksheet: {
+          sheetViews: {
+            sheetView: { zoomScale: "100" }
+          }
+        }
+      })
+    ).toBe(0);
+    expect(buildSheetViewsXml(undefined, undefined, 125)).toBe('<sheetViews><sheetView workbookViewId="0" zoomScale="125"/></sheetViews>');
+    expect(buildSheetViewsXml({ columns: 1 }, false, 90)).toBe(
+      '<sheetViews><sheetView workbookViewId="0" showGridLines="0" zoomScale="90"><pane xSplit="1" topLeftCell="B1" activePane="topRight" state="frozen"/></sheetView></sheetViews>'
+    );
+
+    const blob = await exportXlsxBlob({
+      id: "book-1",
+      title: "Zoom.xlsx",
+      updatedAt: "2026-06-01T00:00:00.000Z",
+      activeSheet: "sheet-1",
+      sheets: [
+        {
+          id: "sheet-1",
+          name: "Zoom",
+          zoomScale: 125,
+          cells: { A1: "Zoomed" }
+        }
+      ]
+    });
+    const zip = await JSZip.loadAsync(await blob.arrayBuffer());
+    const sheetXml = (await zip.file("xl/worksheets/sheet1.xml")?.async("string")) ?? "";
+    const imported = await importXlsxFile(new File([blob], "Zoom.xlsx", { type: blob.type }));
+
+    expect(sheetXml).toContain('<sheetViews><sheetView workbookViewId="0" zoomScale="125"/></sheetViews>');
+    expect(imported.sheets[0].zoomScale).toBe(125);
+  });
+
   it("читает и записывает автофильтр XLSX через autoFilter ref", async () => {
     expect(
       worksheetXmlToAutoFilter({