feat(orders): reopen cancelled orders only after confirmation; accurate sales

Cancelled orders:
- Moving an order out of STORNIERT is possible again, but only after a
  warning is confirmed in the status form (OrderStatusForm); without
  the confirmation the server changes nothing.
- Reopening books the counter-entry to the cancellation: goods that the
  cancellation restocked are deducted again (atomically, only if enough
  stock is left, otherwise the order stays cancelled). A later second
  cancellation therefore restocks +1 again instead of leaving +2.
- The warning states that no new payment is collected.

Dashboard figures:
- One definition of a counted sale (lib/sales.ts): not unpaid (NEU),
  not cancelled, no refunded return. Used for revenue today/month, sold
  glasses, average cart, top products/categories, revenue trend and
  repeat customers.
- "Verkaufte Gläser" previously summed every order item, including
  cancelled orders and refunded returns.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

src/app/admin/bestellungen/page.tsx

@@ -4,6 +4,7 @@ import { BackLink } from "@/components/back-link";
 import { formatPrice, formatDate } from "@/lib/format";
 import { OrderStatusBadge } from "@/components/account-ui";
 import { updateOrderStatusAction } from "../actions";
+import { OrderStatusForm } from "@/components/order-status-form";
 import type { OrderStatus } from "@/generated/prisma/client";
 import { insensitiveContains } from "@/lib/prisma-search";
 import { getLocale } from "@/i18n/locale";
@@ -139,30 +140,16 @@ export default async function AdminOrdersPage(props: PageProps<"/admin/bestellun
                 <td className="p-4 whitespace-nowrap tabular-nums">{formatPrice(order.totalCents, order.currency)}</td>
                 <td className="p-4">
                   <OrderStatusBadge status={order.status} label={statusLabels[order.status] ?? order.status} />
-                  {/* Storniert ist ein Endzustand (isOrderStatusChangeAllowed) — keine Auswahl anbieten, die der Server ablehnt. */}
-                  {order.status !== "STORNIERT" ? (
-                  <form action={updateOrderStatusAction} className="mt-2 flex items-center gap-2">
-                    <input type="hidden" name="orderId" value={order.id} />
-                    <select
-                      name="status"
-                      defaultValue={order.status}
-                      aria-label={t.adminOrdersPage.statusLabel}
-                      className="border border-ink/20 bg-background px-2 py-1.5 text-xs"
-                    >
-                      {Object.entries(statusLabels).map(([value, label]) => (
-                        <option key={value} value={value}>
-                          {label}
-                        </option>
-                      ))}
-                    </select>
-                    <button
-                      type="submit"
-                      className="border border-heading px-3 py-1.5 text-xs text-heading transition-colors duration-300 hover:bg-forest hover:text-cream"
-                    >
-                      {t.adminOrdersPage.save}
-                    </button>
-                  </form>
-                  ) : null}
+                  <OrderStatusForm
+                    action={updateOrderStatusAction}
+                    orderId={order.id}
+                    currentStatus={order.status}
+                    labels={statusLabels}
+                    saveLabel={t.adminOrdersPage.save}
+                    statusAriaLabel={t.adminOrdersPage.statusLabel}
+                    reopenConfirmMessage={t.adminOrdersPage.reopenConfirm}
+                    compact
+                  />
                 </td>
                 <td className="p-4">
                   {order.fulfillmentMethod === "VERSAND" ? t.adminOrdersPage.shipping : t.adminOrdersPage.pickup}