refactor(container-returns): surface the template download in the header

The import template was a link inside the bulk upload modal, so getting the
template meant opening a dialog that asks for the file you do not have yet.
It becomes a Download Template button next to Bulk Upload; the modal keeps
only its one-line explainer.

apps/edr-freight-web/backoffice/src/pages/warehouses/ContainerReturnsPage.tsx

@@ -21,7 +21,7 @@ import {
   Autocomplete,
   Input,
 } from "@mantine/core";
-import { ChevronDown, ChevronRight, FileText, History, Upload } from "lucide-react";
+import { ChevronDown, ChevronRight, Download, FileText, History, Upload } from "lucide-react";
 import { DataTable, type ColumnDef } from "@edr/ui-common";
 
 import { PageContainer, PageHeader } from "@/components/page";
@@ -30,6 +30,7 @@ import RuleEngineListFooter from "@/components/ruleEngine/RuleEngineListFooter";
 import { extractDownloadErrorMessage } from "@/components/warehouses/options";
 import { openPdfBlob } from "@/components/warehouses/pdf";
 import BulkContainerReturnModal from "@/components/warehouses/BulkContainerReturnModal";
+import { downloadContainerReturnTemplate } from "@/components/warehouses/container-return-excel";
 import { useCompanyOptions } from "@/components/warehouses/useCompanyOptions";
 import { OverviewHorizontalBarChart } from "@/components/overview/OverviewHorizontalBarChart";
 import { OverviewStackedBarChart } from "@/components/overview/OverviewStackedBarChart";
@@ -529,6 +530,13 @@ export default function ContainerReturnsPage() {
           ]}
         />
         <Group gap="sm">
+          <Button
+            variant="subtle"
+            leftSection={<Download size={16} />}
+            onClick={() => downloadContainerReturnTemplate()}
+          >
+            Download Template
+          </Button>
           <Button
             variant="default"
             leftSection={<Upload size={16} />}