refactor(web): share allocation workbook export helper

apps/web/src/app/api/reports/allocations/route.ts

@@ -1,13 +1,13 @@
 import { renderToBuffer } from "@react-pdf/renderer";
 import { createElement } from "react";
 import { NextResponse } from "next/server";
-import * as XLSX from "xlsx";
 import { buildSplitAllocationReadModel } from "@capakraken/application";
 import { anonymizeResource, getAnonymizationDirectory } from "@capakraken/api";
 import { prisma } from "@capakraken/db";
 import type { AllocationLike } from "@capakraken/shared";
 import { auth } from "~/server/auth.js";
 import { AllocationReport } from "~/components/reports/AllocationReport.js";
+import { createWorkbookArrayBuffer } from "~/lib/workbook-export.js";
 
 export async function GET(request: Request) {
   const session = await auth();
@@ -74,19 +74,19 @@ export async function GET(request: Request) {
   const ts = Date.now();
 
   if (format === "xlsx") {
-    const sheetData = rows.map((r: typeof rows[number]) => ({
-      Resource: r.resourceName,
-      Project: r.projectName,
-      Role: r.role,
-      "Start Date": r.startDate,
-      "End Date": r.endDate,
-      "Hours/Day": r.hoursPerDay,
-      "Daily Cost (ct)": r.dailyCostCents,
-    }));
-    const ws = XLSX.utils.json_to_sheet(sheetData);
-    const wb = XLSX.utils.book_new();
-    XLSX.utils.book_append_sheet(wb, ws, "Allocations");
-    const buffer = XLSX.write(wb, { type: "buffer", bookType: "xlsx" }) as Buffer;
+    const workbookRows = [
+      ["Resource", "Project", "Role", "Start Date", "End Date", "Hours/Day", "Daily Cost (ct)"],
+      ...rows.map((row) => [
+        row.resourceName,
+        row.projectName,
+        row.role,
+        row.startDate,
+        row.endDate,
+        row.hoursPerDay,
+        row.dailyCostCents,
+      ]),
+    ];
+    const buffer = Buffer.from(await createWorkbookArrayBuffer("Allocations", workbookRows));
     return new NextResponse(buffer as unknown as BodyInit, {
       headers: {
         "Content-Type": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",