Add QExcell cell alignment

src/io/excellOffice.ts

@@ -850,7 +850,8 @@ export function xlsxStylesXmlToCellFormatTable(stylesXml?: unknown): Array<CellF
     const fontFormat = fonts[numberAttribute(record.fontId)];
     const fillFormat = fills[numberAttribute(record.fillId)];
     const numberFormat = normalizedNumberFormat(numberFormats[numberAttribute(record.numFmtId)]);
-    return normalizedCellFormat({ ...fontFormat, ...fillFormat, ...(numberFormat ? { numberFormat } : {}) }) ?? undefined;
+    const horizontalAlign = normalizedHorizontalAlign(String(childRecord(record, "alignment").horizontal || ""));
+    return normalizedCellFormat({ ...fontFormat, ...fillFormat, ...(horizontalAlign ? { horizontalAlign } : {}), ...(numberFormat ? { numberFormat } : {}) }) ?? undefined;
   });
 }
 
@@ -893,8 +894,10 @@ function buildStylesXml(styleRegistry = createCellStyleRegistry([])) {
 
     const applyFont = fontId > 0 ? ' applyFont="1"' : "";
     const applyFill = fillId > 0 ? ' applyFill="1"' : "";
+    const applyAlignment = format.horizontalAlign ? ' applyAlignment="1"' : "";
     const applyNumberFormat = numFmtId > 0 ? ' applyNumberFormat="1"' : "";
-    return `<xf numFmtId="${numFmtId}" fontId="${fontId}" fillId="${fillId}" borderId="0" xfId="0"${applyFont}${applyFill}${applyNumberFormat}/>`;
+    const alignmentXml = format.horizontalAlign ? `<alignment horizontal="${format.horizontalAlign}"/>` : "";
+    return `<xf numFmtId="${numFmtId}" fontId="${fontId}" fillId="${fillId}" borderId="0" xfId="0"${applyFont}${applyFill}${applyAlignment}${applyNumberFormat}>${alignmentXml}</xf>`;
   });
 
   const numFmtsXml =
@@ -933,7 +936,7 @@ function cellFormatKey(format: CellFormat | undefined) {
     return "";
   }
 
-  return `${normalized.bold ? "1" : "0"}|${normalized.italics ? "1" : "0"}|${normalized.underline ? "1" : "0"}|${normalized.textColor ?? ""}|${normalized.fillColor ?? ""}|${normalized.numberFormat ?? ""}`;
+  return `${normalized.bold ? "1" : "0"}|${normalized.italics ? "1" : "0"}|${normalized.underline ? "1" : "0"}|${normalized.textColor ?? ""}|${normalized.fillColor ?? ""}|${normalized.horizontalAlign ?? ""}|${normalized.numberFormat ?? ""}`;
 }
 
 function fontStyleKey(format: CellFormat) {
@@ -945,6 +948,7 @@ function fontStyleKey(format: CellFormat) {
 function normalizedCellFormat(format: CellFormat | undefined): CellFormat | null {
   const textColor = normalizeFillColor(format?.textColor);
   const fillColor = normalizeFillColor(format?.fillColor);
+  const horizontalAlign = normalizedHorizontalAlign(format?.horizontalAlign);
   const numberFormat = normalizedNumberFormat(format?.numberFormat);
   const normalized: CellFormat = {
     ...(format?.bold ? { bold: true } : {}),
@@ -952,6 +956,7 @@ function normalizedCellFormat(format: CellFormat | undefined): CellFormat | null
     ...(format?.underline ? { underline: true } : {}),
     ...(textColor ? { textColor } : {}),
     ...(fillColor ? { fillColor } : {}),
+    ...(horizontalAlign ? { horizontalAlign } : {}),
     ...(numberFormat ? { numberFormat } : {})
   };
 
@@ -1000,6 +1005,11 @@ function normalizeFillColor(value?: string) {
   return /^[0-9A-F]{6}$/.test(raw) ? raw : "";
 }
 
+function normalizedHorizontalAlign(value?: string) {
+  const normalized = value?.trim().toLowerCase() ?? "";
+  return normalized === "left" || normalized === "center" || normalized === "right" ? normalized : "";
+}
+
 function normalizedNumberFormat(value?: string) {
   const raw = value?.trim() ?? "";
   if (!raw || raw.toLowerCase() === "general") {