Fix textbox-question render failures on mobile-details and schedule

Harden the shared textbox-question component and its mobile flow parents
to prevent runtime-1 "undefined is not a function" errors seen in
CloudWatch (chunk 5615 / textbox-question.vue).

- Coerce modelValue to a string in textbox-question setup and value getter
- Ensure v-maska always receives a string mask
- Guard the value watcher when handleChange is unavailable
- Fix mobile-details v-model bindings (remove invalid this. prefix)
- Coerce address fields from store to strings before binding
- Correct malformed modelValue prop definitions on vehicle-protected-question
  and service-zip-question
- Add unit test for null modelValue coercion

src/digital-components/textbox-question/textbox-question.spec.js

@@ -13,6 +13,22 @@ const mockMixin = {
 const maska = jest.fn();
 
 describe("textboxQuestion.vue", () => {
+    it("Should coerce non-string modelValue to empty string for v-model.trim", async () => {
+        const wrapper = shallowMount(textboxQuestion, {
+            global: {
+                directives: {
+                    maska: maska,
+                },
+            },
+            propsData: {
+                modelValue: null,
+            },
+            mixins: [mockMixin],
+        });
+
+        expect(wrapper.vm.value).toBe("");
+    });
+
     it("Should render a text input", async () => {
         // Arrange
         const wrapper = shallowMount(textboxQuestion, {

src/digital-components/textbox-question/textbox-question.vue

@@ -25,7 +25,7 @@
             <input
                 class="form-control"
                 v-model.trim="value"
-                v-maska="mask"
+                v-maska="effectiveMask"
                 :type="type"
                 :ref="inputId"
                 :id="inputId"
@@ -90,6 +90,19 @@ import loader from "@/ux-components/loader/loader.vue";
 import { ref } from "vue";
 import { v4 as uuidv4 } from "uuid";
 
+function coerceTextboxValue(modelValue) {
+    if (modelValue == null) {
+        return "";
+    }
+    if (typeof modelValue === "number") {
+        return String(modelValue);
+    }
+    if (typeof modelValue === "string") {
+        return modelValue;
+    }
+    return "";
+}
+
 export default {
     name: "textbox-question",
     props: {
@@ -145,18 +158,8 @@ export default {
         const inputId = !props.customInputId ? `input-${uuid}` : props.customInputId;
 
         const propsClone = Object.assign({}, props);
-        const modelValue = propsClone.modelValue;
+        const modelValue = coerceTextboxValue(propsClone.modelValue);
-        let initialValue;
+        const initialValue = modelValue;
-        let isImageProcessing = ref(false);
-
-        switch (typeof modelValue) {
-            case "number":
-                initialValue = modelValue;
-                break;
-            default:
-                initialValue = modelValue && modelValue.length > 0 ? modelValue : "";
-                break;
-        }
 
         const fieldOptions = {
             type: "text",
@@ -164,6 +167,8 @@ export default {
             initialValue: initialValue,
         };
 
+        let isImageProcessing = ref(false);
+
         const { errorMessage, handleBlur, handleChange, meta, validate, errors } = useField(
             inputId,
             props.validationRules,
@@ -223,18 +228,25 @@ export default {
         },
         value: {
             get: function () {
-                return this.modelValue;
+                return coerceTextboxValue(this.modelValue);
             },
             set: function (newValue) {
                 this.$emit("update:modelValue", newValue);
             },
         },
+        effectiveMask() {
+            return this.mask ?? "";
+        },
     },
     mounted() {
         this.$emit("textboxQuestionEvent.inputIdAssigned", this.inputId);
     },
     watch: {
         async value(newValue) {
+            if (typeof this.handleChange !== "function") {
+                return;
+            }
+
             const result = await validate(newValue, this.validationRules); // do a test validation check, without triggering full validation
             if (result.valid) {
                 this.handleChange(newValue); // trigger full validation on this field only

src/layouts/mobile-details/mobile-details.vue

@@ -34,7 +34,7 @@
                                 class="keys-message" />
                             <mobileAddressQuestions
                                 ref="addressQuestions"
-                                v-model="this.addressQuestions"
+                                v-model="addressQuestions"
                                 captureApartmentNumberOrBusinessName="true"
                                 preserveCityAndStateOnReset="true"
                                 labelBold="true"
@@ -42,7 +42,7 @@
                                 isZipCodeDisabled="true" />
                             <vehicleProtectedQuestion
                                 ref="vehicleProtectedQuestion"
-                                v-model="this.isVehicleProtected"
+                                v-model="isVehicleProtected"
                                 cmsWidgetName="VehicleProtectedQuestionWidget"
                                 labelBold="true" />
                             <textBlock
@@ -84,11 +84,11 @@ export default {
     data() {
         return {
             addressQuestions: {
-                streetAddress: this.getServiceAddressFromStore(),
+                streetAddress: String(this.getServiceAddressFromStore() ?? ""),
-                apartmentNumberOrBusinessName: this.getServiceAddress2FromStore(),
+                apartmentNumberOrBusinessName: String(this.getServiceAddress2FromStore() ?? ""),
-                city: this.getServiceCityFromStore(),
+                city: String(this.getServiceCityFromStore() ?? ""),
-                state: this.getServiceStateFromStore(),
+                state: String(this.getServiceStateFromStore() ?? ""),
-                zipCode: this.getServiceZipCodeFromStore(),
+                zipCode: String(this.getServiceZipCodeFromStore() ?? ""),
             },
             isVehicleProtected: this.getIsVehicleProtectedFromStore(),
         };

src/layouts/service-location/mobile-location-modal-questions/vehicle-protected-question/vehicle-protected-question.vue

@@ -25,7 +25,8 @@ export default {
     name: "vehicle-protected-question",
     props: {
         modelValue: {
-            isVehicleProtected: Boolean,
+            type: Boolean,
+            default: null,
         },
         cmsWidgetName: String,
         labelBold: {

src/layouts/service-location/service-zip-modal-question/service-zip-question/service-zip-question.vue

@@ -29,7 +29,8 @@ export default {
     name: "service-zip-question",
     props: {
         modelValue: {
-            serviceZipCode: String,
+            type: String,
+            default: "",
         },
         cmsWidgetName: String,
         isRequired: {