feat(freight): add download for the TIN business registration record

Ticket #181 — eTrade auto-fetch already existed; adds a client-side
download of the fetched record (eTrade returns data, not a document)
on the portal onboarding step and the backoffice customer detail page.

apps/edr-freight-web/backoffice/src/pages/customers/CustomerDetailPage.tsx

@@ -65,6 +65,7 @@ import {
 } from "@/services/files.service";
 import { api } from "@/services/api";
 import type {
+  Company,
   CompanyProfile,
   CustomerBooking,
   CustomerDocument,
@@ -79,6 +80,32 @@ import {
   type ColumnDef,
 } from "@edr/ui-common";
 
+/** Plain-text summary of the company's eTrade-sourced record, downloaded client-side (eTrade returns data, not a document). */
+function downloadTinRecord(company: Company) {
+  const lines = [
+    `TIN: ${company.tin}`,
+    `Company name: ${company.name}`,
+    `Licence number: ${company.licenceNumber ?? ""}`,
+    `Status: ${company.statusDescription ?? ""}`,
+    `Date registered: ${company.dateRegistered ?? ""}`,
+    `Renewed from: ${company.renewedFrom ?? ""}`,
+    `Renewal date: ${company.renewalDate ?? ""}`,
+    `Renewed to: ${company.renewedTo ?? ""}`,
+    `Address: ${[company.region, company.zone, company.woreda, company.kebele, company.houseNo].filter(Boolean).join(", ")}`,
+  ];
+  const blob = new Blob([lines.join("\n")], {
+    type: "text/plain;charset=utf-8",
+  });
+  const url = URL.createObjectURL(blob);
+  const a = document.createElement("a");
+  a.href = url;
+  a.download = `tin-${company.tin}.txt`;
+  document.body.appendChild(a);
+  a.click();
+  a.remove();
+  setTimeout(() => URL.revokeObjectURL(url), 60_000);
+}
+
 function InfoField({ label, value }: { label: string; value?: string | null }) {
   return (
     <Stack gap={2}>
@@ -814,18 +841,29 @@ export default function CustomerDetailPage() {
 
             <Card>
               <Stack gap="lg">
-                <Group gap="xs" wrap="nowrap">
-                  <Text fw={600} c="edr-text">
-                    eTrade registration
-                  </Text>
-                  {hasEtradeRecord ? (
-                    <Badge size="sm" color="edr-green" variant="light">
-                      Verified with eTrade
-                    </Badge>
-                  ) : (
-                    <Badge size="sm" color="gray" variant="light">
-                      No eTrade record
-                    </Badge>
+                <Group gap="xs" wrap="nowrap" justify="space-between">
+                  <Group gap="xs" wrap="nowrap">
+                    <Text fw={600} c="edr-text">
+                      eTrade registration
+                    </Text>
+                    {hasEtradeRecord ? (
+                      <Badge size="sm" color="edr-green" variant="light">
+                        Verified with eTrade
+                      </Badge>
+                    ) : (
+                      <Badge size="sm" color="gray" variant="light">
+                        No eTrade record
+                      </Badge>
+                    )}
+                  </Group>
+                  {hasEtradeRecord && (
+                    <ActionIcon
+                      variant="default"
+                      aria-label="Download TIN record"
+                      onClick={() => downloadTinRecord(company)}
+                    >
+                      <Download size={16} />
+                    </ActionIcon>
                   )}
                 </Group>
                 {hasEtradeRecord ? (