Fix: Move carrier live-pricing choice onto ShippingMethod.charge_by

Reverts the earlier per-rate pricing_mode column in favor of extending Lunar's existing charge_by field (cart_total/weight) with a third "live" option, gated by a SupportsLivePricing capability check on the driver. Adds a shared ResolvesFixedPricing trait so any carrier driver can fall back to Lunar's normal price-break resolution, matching the vendor ShipBy driver's own charge_by handling instead of introducing a separate mechanism. Also fixes an incorrect Get() path in the admin form that silently hid the new "live" option.

src/Shipping/Carriers/BoxNow/BoxNowRateDriver.php

@@ -3,19 +3,21 @@
 namespace Modules\Core\Shipping\Carriers\BoxNow;
 
 use Lunar\DataTypes\ShippingOption;
-use Lunar\Facades\Pricing;
 use Lunar\Shipping\DataTransferObjects\ShippingOptionRequest;
 use Lunar\Shipping\Interfaces\ShippingRateInterface;
 use Lunar\Shipping\Models\ShippingRate;
+use Modules\Core\Shipping\Concerns\ResolvesFixedPricing;
 
 /**
- * Box Now has no pricing API, so this always resolves the admin-configured
- * price/price-breaks on the ShippingRate — the same mechanism the built-in
- * flat-rate driver uses. Unlike AcsRateDriver, this does not implement
- * SupportsLivePricing: there is nothing to toggle between.
+ * Box Now has no pricing API, so this always resolves the method's normal
+ * charge_by + price-break configuration — the same mechanism the built-in
+ * flat-rate/ship-by drivers use. Does not implement SupportsLivePricing:
+ * there is no live option to offer.
  */
 class BoxNowRateDriver implements ShippingRateInterface
 {
+    use ResolvesFixedPricing;
+
     public ShippingRate $shippingRate;
 
     public function name(): string
@@ -30,25 +32,10 @@ class BoxNowRateDriver implements ShippingRateInterface
 
     public function resolve(ShippingOptionRequest $shippingOptionRequest): ?ShippingOption
     {
-        $shippingRate = $shippingOptionRequest->shippingRate;
-        $shippingMethod = $shippingRate->shippingMethod;
-        $cart = $shippingOptionRequest->cart;
-
-        $subTotal = $cart->lines->sum('subTotal.value');
-
-        $pricing = Pricing::for($shippingRate)->qty($subTotal)->get();
-
-        if (! $pricing->matched) {
-            return null;
-        }
-
-        return new ShippingOption(
-            name: $shippingMethod->name ?: $this->name(),
-            description: $shippingMethod->description ?: $this->description(),
-            identifier: $shippingRate->getIdentifier(),
-            price: $pricing->matched->price,
-            taxClass: $shippingRate->getTaxClass(),
-            taxReference: $shippingRate->getTaxReference(),
+        return $this->resolveFixedPrice(
+            $shippingOptionRequest->shippingRate,
+            $shippingOptionRequest->shippingRate->shippingMethod,
+            $shippingOptionRequest->cart,
         );
     }