feat(pos): print customer receipt from the POS page

POS v2 auto-printed the receipt on full payment but had no manual button. Adds a
"چاپ فاکتور" (print receipt) action in the order panel that prints/reprints the
active saved order's customer receipt, plus a "print receipt" action on the
payment-success toast. Replaces the dead disabled "hold" placeholder button.
Backend print endpoint unchanged.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/dashboard/src/components/pos2/pos2-screen.tsx

@@ -10,7 +10,7 @@
 import { useEffect, useMemo, useState } from "react";
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
 import {
-  Search, Plus, Minus, Trash2, Send, CreditCard, Pause, SplitSquareHorizontal,
+  Search, Plus, Minus, Trash2, Send, CreditCard, SplitSquareHorizontal,
   X, WifiOff, ShoppingCart, Users, Coffee, ArrowRight, LayoutGrid, Armchair,
   Banknote, Check, Delete, ReceiptText, ShoppingBag, Loader2, RotateCcw,
   BadgePercent, Sparkles, Home, StickyNote,
@@ -24,6 +24,7 @@ import { useCartStore } from "@/lib/stores/cart.store";
 import { apiGet, apiPost, ApiClientError } from "@/lib/api/client";
 import { submitOrderToApi, orderAmountDue, isLocalOrder } from "@/lib/pos/submit-order";
 import { requestPosPayment, posDeviceErrorMessage } from "@/lib/api/pos-device";
+import { printReceipt } from "@/lib/api/print";
 import { PosCustomerPicker } from "@/components/pos/pos-customer-picker";
 import { Can } from "@/components/auth/can";
 import type { Customer, MenuItem, Order, TableBoardItem } from "@/lib/api/types";
@@ -107,6 +108,7 @@ export function Pos2Screen() {
   const hydrateFromOrder = useCartStore((s) => s.hydrateFromOrder);
   const clearSession = useCartStore((s) => s.clearSession);
   const activeOrderNo = useCartStore((s) => s.activeOrderDisplayNumber);
+  const activeOrderId = useCartStore((s) => s.activeOrderId);
   const appliedCoupon = useCartStore((s) => s.appliedCoupon);
 
   // local view state
@@ -285,7 +287,10 @@ export function Pos2Screen() {
         loyaltyPointsToRedeem: loyaltyRedeem > 0 ? loyaltyRedeem : undefined,
       });
       const paid = payments.reduce((s, p) => s + p.amount, 0);
-      notify.success(`پرداخت ${fmt(paid)} تومان ثبت شد`);
+      const paidOrderId = payTarget.id;
+      notify.success(`پرداخت ${fmt(paid)} تومان ثبت شد`, {
+        action: { label: "چاپ فاکتور", onClick: () => void printReceipt(cafeId as string, paidOrderId) },
+      });
       queryClient.invalidateQueries({ queryKey: ["tables-board", cafeId] });
       queryClient.invalidateQueries({ queryKey: ["orders-open", cafeId] });
       backToBoard();
@@ -302,6 +307,27 @@ export function Pos2Screen() {
     }
   };
 
+  // Print (or reprint) the customer receipt for the active, already-saved order.
+  const printActiveReceipt = async () => {
+    if (!activeOrderId || isLocalOrder(activeOrderId)) {
+      notify.error("ابتدا سفارش را ثبت کنید");
+      return;
+    }
+    try {
+      await printReceipt(cafeId as string, activeOrderId);
+      notify.success("فاکتور برای چاپ ارسال شد");
+    } catch (e) {
+      const code = e instanceof ApiClientError ? e.code : "";
+      notify.error(
+        code === "PRINTER_NOT_CONFIGURED" || code === "KITCHEN_PRINTER_NOT_CONFIGURED"
+          ? "پرینتر فاکتور تنظیم نشده است"
+          : code === "PRINTER_CONNECTION_FAILED"
+            ? "اتصال به پرینتر برقرار نشد"
+            : "چاپ فاکتور ناموفق بود",
+      );
+    }
+  };
+
   // ── guards ───────────────────────────────────────────────────────────────
   if (!cafeId) {
     return (
@@ -322,6 +348,8 @@ export function Pos2Screen() {
     onBump: (id: string, d: number) => { const l = items.find((x) => x.menuItem.id === id); if (l) updateQty(id, l.quantity + d); },
     onRemove: removeItem, onSend: send, onPay: openPay, onSplit: openPay,
     onNote: (id: string, notes: string) => setNotes(id, notes),
+    canPrint: !!activeOrderId && !isLocalOrder(activeOrderId),
+    onPrintReceipt: printActiveReceipt,
   };
 
   // ── TABLE BOARD ────────────────────────────────────────────────────────────
@@ -673,13 +701,14 @@ function Pos2Extras({ cafeId }: { cafeId: string }) {
 // ── Order ticket ─────────────────────────────────────────────────────────────
 type TicketLine = { menuItem: MenuItem; quantity: number; notes?: string };
 function Ticket({
-  cafeId, lines, subtotal, discount, tax, total, count, pendingCount, onBump, onRemove, onNote, onSend, onPay, onSplit,
+  cafeId, lines, subtotal, discount, tax, total, count, pendingCount, onBump, onRemove, onNote, onSend, onPay, onSplit, canPrint, onPrintReceipt,
 }: {
   cafeId: string; lines: TicketLine[]; subtotal: number; discount: number; tax: number; total: number;
   count: number; pendingCount: number;
   onBump: (id: string, d: number) => void; onRemove: (id: string) => void;
   onNote: (id: string, notes: string) => void;
   onSend: () => void; onPay: () => void; onSplit: () => void;
+  canPrint: boolean; onPrintReceipt: () => void;
 }) {
   const [noteFor, setNoteFor] = useState<string | null>(null);
   return (
@@ -762,8 +791,10 @@ function Ticket({
             <CreditCard className="size-5" /> پرداخت
           </button>
         </Can>
-        <button type="button" disabled className="flex min-h-[48px] items-center justify-center gap-1.5 rounded-xl bg-muted text-sm font-medium text-muted-foreground opacity-50">
+        <button type="button" disabled={!canPrint} onClick={onPrintReceipt}
-          <Pause className="size-4" /> نگه‌داشتن
+          className="flex min-h-[48px] items-center justify-center gap-1.5 rounded-xl bg-muted text-sm font-medium text-foreground hover:bg-accent disabled:opacity-40"
+          title="چاپ فاکتور مشتری">
+          <ReceiptText className="size-4" /> چاپ فاکتور
         </button>
         <Can permission="HandlePayments">
           <button type="button" disabled={count === 0} onClick={onSplit}