Put the store update methods back on the vehicle vue components.

src/layouts/vehicle-make/vehicle-make.vue

@@ -91,7 +91,7 @@
         },
         watch: {
           selectedMake(make) {
-            this.mainStore.order.vehicle.make = make;
+            this.mainStore.updateVehicleMake(make); 
             this.$router.navigate(
               this.navigationScenarios.SELECTED_MAKE,
               this.$route

src/layouts/vehicle-model/vehicle-model.vue

@@ -84,7 +84,7 @@
   
     watch: {
       selectedModel(model) {
-        this.mainStore.order.vehicle.model = model;
+        this.mainStore.updateVehicleModel(model);
         this.$router.navigate(
           this.navigationScenarios.SELECTED_MODEL,
           this.$route

src/layouts/vehicle-style/vehicle-style.vue

@@ -78,7 +78,7 @@ export default {
 
     watch: {
         selectedStyle(style) {
-            this.mainStore.order.vehicle.style = style;
+            this.mainStore.updateVehicleStyle(style);
             this.$router.navigate(
                 this.navigationScenarios.SELECTED_STYLE,
                 this.$route

src/layouts/vehicle-year/vehicle-year.vue

@@ -70,7 +70,7 @@
     watch: {
       selectedYear(year) {
         const parsedYear = parseInt(year);
-        this.mainStore.order.vehicle.year = parsedYear; 
+        this.mainStore.updateVehicleYear(parsedYear); 
         this.$router.navigate(
           this.navigationScenarios.SELECTED_YEAR,
           this.$route

src/mixins/base-mixin.js

@@ -1,6 +1,7 @@
+
 import { mapStores } from "pinia";
 import { useMainStore } from "@/store";
-
+;
 import { navigationScenarios } from "@/router/router-constants/navigation-scenarios";
 import { vehicleCategories } from "@/constants/vehicle-categories.js";
 import { queryStrings } from "@/constants/query-strings";

src/store/index.js

@@ -189,6 +189,35 @@ export const useMainStore = defineStore({
           payload: {},
         });
       },
+
+      // Vehicle API Actions
+      updateVehicleYear(year) 
+      {
+        if (this.order.vehicle.year !== year) {
+          this.order.vehicle.year = year;
+        }
+      },
+
+      updateVehicleMake(make) 
+      {
+        if (this.order.vehicle.make !== make) {
+          this.order.vehicle.make = make;
+        }
+      },
+
+      updateVehicleModel(model) 
+      {
+        if (this.order.vehicle.model !== model) {
+          this.order.vehicle.model = model;
+        }
+      },
+
+      updateVehicleStyle(style) 
+      {
+        if (this.order.vehicle.style !== style) {
+          this.order.vehicle.style = style;
+        }
+      },
       addEventToBus (event) {
         this.applicationUser.eventBus.push(event);
       },