Add dual-screen customer display for the register.

Token-gated full-screen customer view shows order, payment QR, tips,
signature, receipt, and promo phases while the till keeps operator UI.

app/Http/Controllers/Pos/RegisterController.php

@@ -7,6 +7,7 @@ use App\Http\Controllers\Pos\Concerns\ScopesToAccount;
 use App\Models\PosLocation;
 use App\Models\PosProduct;
 use App\Models\PosSale;
+use App\Services\Pos\CustomerDisplayService;
 use App\Services\Pos\PosBarcodeLookupService;
 use App\Services\Pos\PosLocationService;
 use App\Services\Pos\PosSaleService;
@@ -25,18 +26,24 @@ class RegisterController extends Controller
         private PosSaleService $sales,
         private PosLocationService $locations,
         private PosBarcodeLookupService $barcodes,
+        private CustomerDisplayService $customerDisplays,
     ) {}
 
     public function index(Request $request): View
     {
         $owner = $this->ownerRef($request);
         $location = $this->location($request);
+        $display = $this->customerDisplays->ensureForLocation($location);
 
         return view('pos.register', [
             'products' => $this->registerProducts($owner, $location),
             'location' => $location,
             'crmCustomers' => $this->crmCustomers($owner),
             'barcodeLookupUrl' => route('pos.register.lookup'),
+            'customerDisplayUrl' => $this->customerDisplays->displayUrl($display),
+            'customerDisplayPushUrl' => route('pos.customer-display.push'),
+            'customerDisplayActionsUrl' => route('pos.customer-display.actions'),
+            'isRestaurant' => $location->isRestaurant(),
         ]);
     }
 
@@ -163,6 +170,7 @@ class RegisterController extends Controller
 
             if ($data['payment_method'] === 'cash') {
                 $this->sales->recordCashPayment($sale);
+                $this->customerDisplays->pushReceipt($location, $sale->fresh(['lines']));
 
                 if ($location->printer_auto_print) {
                     return redirect()
@@ -176,18 +184,26 @@ class RegisterController extends Controller
             }
 
             $result = $this->sales->initiatePayCheckout($sale, $merchant);
+            $checkoutUrl = $result['checkout_url'] ?? null;
+
+            $this->customerDisplays->pushPayment($location, $sale->fresh(['lines']), [
+                'checkout_url' => $checkoutUrl,
+                'qr_url' => $checkoutUrl,
+                'message' => 'Complete payment with card or MoMo',
+                'options' => ['Card / MoMo'],
+            ]);
 
             if ($request->expectsJson() || $request->ajax()) {
                 return response()->json([
-                    'checkout_url' => $result['checkout_url'],
+                    'checkout_url' => $checkoutUrl,
                     'sale_id' => $sale->id,
                 ]);
             }
 
             return redirect()
                 ->route('pos.sales.show', $sale)
-                ->with('checkout_url', $result['checkout_url'])
-                ->with('success', 'Payment sheet ready — hand the device to the customer for card or MoMo.');
+                ->with('checkout_url', $checkoutUrl)
+                ->with('success', 'Payment sheet ready — customer screen shows the QR; till sheet is for the operator.');
         } catch (RuntimeException $e) {
             return back()->withInput()->with('error', $e->getMessage());
         }