fix: update kitchen printer quantity mapping and standardize return format for print status results

static/src/app/services/pos_store.js

@@ -32,7 +32,7 @@ patch(PosStore.prototype, {
             // Build the data object to send to backend
             const lines = changesData.map(c => ({
                 name: c.name,
-                qty: c.qty,
+                qty: c.quantity || c.qty || 1,
                 note: c.note || ''
             }));
             
@@ -56,16 +56,16 @@ patch(PosStore.prototype, {
                         result.message || "Network printer error",
                         { type: "danger" }
                     );
-                    return false;
+                    return { successful: false, message: { body: result.message || "Network printer error" } };
                 }
-                return true;
+                return { successful: true };
             } catch (error) {
                 console.error("Error printing to network printer", error);
                 this.env.services.notification.add(
                     "Error printing to network printer",
                     { type: "danger" }
                 );
-                return false;
+                return { successful: false, message: { body: error.message || "Error printing to network printer" } };
             }
         }