Preserve QExcell font sizes

src/features/qexcell/QExcell.tsx

@@ -81,6 +81,7 @@ const horizontalAlignOptions = [
   { value: "center", label: "По центру", icon: AlignCenter },
   { value: "right", label: "По правому краю", icon: AlignRight }
 ] as const;
+const fontSizeOptions = [10, 11, 12, 14, 16, 18, 20, 24];
 
 function normalizedLinkInput(value: string | null) {
   const raw = value?.trim();
@@ -108,10 +109,12 @@ function normalizedCellFormat(format: CellFormat): CellFormat | undefined {
   const fillColor = normalizedFillColor(format.fillColor);
   const horizontalAlign = normalizedHorizontalAlign(format.horizontalAlign);
   const numberFormat = format.numberFormat?.trim();
+  const fontSize = normalizedFontSize(format.fontSize);
   const normalized: CellFormat = {
     ...(format.bold ? { bold: true } : {}),
     ...(format.italics ? { italics: true } : {}),
     ...(format.underline ? { underline: true } : {}),
+    ...(fontSize ? { fontSize } : {}),
     ...(textColor ? { textColor } : {}),
     ...(fillColor ? { fillColor } : {}),
     ...(horizontalAlign ? { horizontalAlign } : {}),
@@ -126,6 +129,7 @@ function cellInputStyle(format?: CellFormat): CSSProperties {
     ...(format?.bold ? { fontWeight: 700 } : {}),
     ...(format?.italics ? { fontStyle: "italic" } : {}),
     ...(format?.underline ? { textDecoration: "underline" } : {}),
+    ...(format?.fontSize ? { fontSize: `${format.fontSize}pt` } : {}),
     ...(format?.textColor ? { color: `#${format.textColor}` } : {}),
     ...(format?.fillColor ? { backgroundColor: `#${format.fillColor}` } : {}),
     ...(format?.horizontalAlign ? { textAlign: format.horizontalAlign } : {})
@@ -136,6 +140,15 @@ function normalizedHorizontalAlign(value?: string) {
   return value === "left" || value === "center" || value === "right" ? value : "";
 }
 
+function normalizedFontSize(value?: number) {
+  if (!Number.isFinite(value) || !value || value <= 0) {
+    return undefined;
+  }
+
+  const normalized = Math.round(value * 2) / 2;
+  return normalized === 11 ? undefined : normalized;
+}
+
 function normalizedChartRange(value: string) {
   const raw = value.trim().replace(/\$/g, "").toUpperCase();
   const [start, end = start] = raw.split(":");
@@ -493,6 +506,21 @@ export function QExcell({ workbook, onChange }: QExcellProps) {
                 </button>
               );
             })}
+            <select
+              value={selectedCellFormat.fontSize ?? ""}
+              onChange={(event) =>
+                updateCellFormat(selectedCell, { fontSize: event.target.value ? Number(event.target.value) : undefined })
+              }
+              aria-label="Размер шрифта"
+              title="Размер шрифта"
+            >
+              <option value="">Размер</option>
+              {fontSizeOptions.map((fontSize) => (
+                <option key={fontSize} value={fontSize}>
+                  {fontSize}
+                </option>
+              ))}
+            </select>
             <div className="fill-swatches" aria-label="Заливка">
               <PaintBucket size={16} aria-hidden="true" />
               {fillSwatches.map((swatch) => (