Phase3: Billing Customerpage/Mailings

src/components/billing/customer-invoice-detail.tsx

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+import { useTranslations, useFormatter } from "next-intl";
+import { Card } from "@/components/ui/card";
+import type { Invoice, InvoiceLine } from "@/types";
+
+interface Props {
+  invoice: Invoice;
+  lines: InvoiceLine[];
+}
+
+const statusColors: Record<string, string> = {
+  issued: "text-text-secondary bg-surface-3",
+  paid: "text-success bg-success/10",
+  overdue: "text-error bg-error/10",
+  void: "text-text-muted bg-surface-3",
+};
+
+/**
+ * Read-only invoice detail. Flat list of lines — no per-tenant
+ * grouping (one invoice per customer; the tenant context is
+ * already embedded in each line description).
+ *
+ * The download link points at /api/billing/invoices/[n]/pdf
+ * which serves the stored PDF blob inline. Customers using a
+ * link from their email will hit the same route via this page.
+ */
+export function CustomerInvoiceDetail({ invoice, lines }: Props) {
+  const t = useTranslations("customerBilling");
+  const fmt = useFormatter();
+
+  return (
+    <div className="space-y-6 animate-in">
+      <div className="flex items-start justify-between gap-4 flex-wrap">
+        <div>
+          <div className="flex items-center gap-3 mb-2">
+            <h1 className="font-display text-2xl font-semibold">
+              {invoice.invoiceNumber}
+            </h1>
+            <span
+              className={`text-[10px] uppercase tracking-wider px-2 py-1 rounded-md font-semibold ${
+                statusColors[invoice.status] ?? "text-text-muted bg-surface-3"
+              }`}
+            >
+              {t(`status.${invoice.status}` as any)}
+            </span>
+          </div>
+          <p className="text-sm text-text-secondary">
+            {fmt.dateTime(new Date(invoice.periodStart), { dateStyle: "long" })}
+            <span className="text-text-muted mx-1">→</span>
+            {fmt.dateTime(new Date(invoice.periodEnd), { dateStyle: "long" })}
+          </p>
+        </div>
+        <a
+          href={`/api/billing/invoices/${encodeURIComponent(invoice.invoiceNumber)}/pdf`}
+          target="_blank"
+          rel="noopener noreferrer"
+          className="px-4 py-2 rounded-md bg-accent text-white text-sm font-medium hover:bg-accent-dim transition-colors"
+        >
+          {t("downloadPdf")}
+        </a>
+      </div>
+
+      <Card>
+        <div className="space-y-2 mb-4">
+          <div className="flex justify-between text-sm">
+            <span className="text-text-muted">{t("billedToLabel")}</span>
+            <span>{invoice.billingSnapshot.companyName}</span>
+          </div>
+          <div className="flex justify-between text-sm">
+            <span className="text-text-muted">{t("issuedAtLabel")}</span>
+            <span>
+              {fmt.dateTime(new Date(invoice.issuedAt), { dateStyle: "medium" })}
+            </span>
+          </div>
+          <div className="flex justify-between text-sm">
+            <span className="text-text-muted">{t("dueAtLabel")}</span>
+            <span>
+              {fmt.dateTime(new Date(invoice.dueAt), { dateStyle: "medium" })}
+            </span>
+          </div>
+          {invoice.status === "paid" && invoice.paidAt && (
+            <div className="flex justify-between text-sm">
+              <span className="text-text-muted">{t("paidAtLabel")}</span>
+              <span>
+                {fmt.dateTime(new Date(invoice.paidAt), { dateStyle: "medium" })}
+              </span>
+            </div>
+          )}
+        </div>
+      </Card>
+
+      <Card>
+        <table className="w-full text-sm">
+          <thead className="text-xs text-text-muted text-left">
+            <tr>
+              <th className="pb-2">{t("descriptionCol")}</th>
+              <th className="pb-2 text-right">{t("qtyCol")}</th>
+              <th className="pb-2 text-right">{t("unitCol")}</th>
+              <th className="pb-2 text-right">{t("amountCol")}</th>
+            </tr>
+          </thead>
+          <tbody>
+            {lines.map((ln) => (
+              <tr key={ln.id} className="border-t border-border align-top">
+                <td className="py-2">{ln.description}</td>
+                <td className="py-2 text-right font-mono text-xs">
+                  {ln.quantity}
+                  {ln.unitLabel ? ` ${ln.unitLabel}` : ""}
+                </td>
+                <td className="py-2 text-right font-mono text-xs">
+                  {ln.unitPriceChf.toFixed(2)}
+                </td>
+                <td className="py-2 text-right font-mono">
+                  {ln.amountChf.toFixed(2)}
+                </td>
+              </tr>
+            ))}
+          </tbody>
+          <tfoot>
+            <tr className="border-t border-border">
+              <td colSpan={3} className="pt-3 text-right text-text-muted">
+                {t("subtotalLabel")}
+              </td>
+              <td className="pt-3 text-right font-mono">
+                {invoice.subtotalChf.toFixed(2)}
+              </td>
+            </tr>
+            <tr>
+              <td colSpan={3} className="pt-1 text-right text-text-muted">
+                {t("vatLabel", { rate: invoice.vatRate.toFixed(2) })}
+              </td>
+              <td className="pt-1 text-right font-mono">
+                {invoice.vatAmountChf.toFixed(2)}
+              </td>
+            </tr>
+            <tr>
+              <td colSpan={3} className="pt-2 text-right font-semibold">
+                {t("totalLabel")}
+              </td>
+              <td className="pt-2 text-right font-mono font-semibold text-base">
+                CHF {invoice.totalChf.toFixed(2)}
+              </td>
+            </tr>
+          </tfoot>
+        </table>
+      </Card>
+    </div>
+  );
+}