feat: show ErrorNotification in ReportSubmitted on submission failure

- Add ErrorNotification component above the contact form
- Replace console.error with user-visible error messages in
  handleSubmit for both HTTP error responses and exceptions
- Add isSubmitting ref with :disabled binding to prevent
  double-submission (consistent with Nuisance/Water forms)
- Clear errorMessage on each submission attempt

Issue: #8

ts/rmo/view/ReportSubmitted.vue

@@ -46,6 +46,11 @@
 								Please provide your contact information in case the district has
 								any follow-up questions.
 							</p>
+							<ErrorNotification
+								v-if="errorMessage"
+								:message="errorMessage"
+								@dismissed="errorMessage = ''"
+							/>
 							<form
 								id="notificationForm"
 								@submit.prevent="handleSubmit"
@@ -193,7 +198,11 @@
 									</label>
 								</div>
 
-								<button type="submit" class="btn btn-primary">
+								<button
+									type="submit"
+									class="btn btn-primary"
+									:disabled="isSubmitting"
+								>
 									Update report
 								</button>
 							</form>
@@ -279,6 +288,7 @@ import { ref, onMounted } from "vue";
 import { computedAsync } from "@vueuse/core";
 import { useRouter } from "vue-router";
 
+import ErrorNotification from "@/rmo/components/ErrorNotification.vue";
 import Tooltip from "@/components/Tooltip.vue";
 import { formatReportID } from "@/format";
 import { useRoutes } from "@/rmo/route/use";
@@ -302,6 +312,8 @@ interface Props {
 
 const props = defineProps<Props>();
 
+const errorMessage = ref("");
+const isSubmitting = ref(false);
 const formData = ref<FormData>({
 	can_sms: true,
 	consent: true,
@@ -326,6 +338,8 @@ const district = computedAsync(async (): Promise<District | undefined> => {
 	return await storeDistrict.byURI(report.value.district);
 });
 const handleSubmit = async () => {
+	isSubmitting.value = true;
+	errorMessage.value = "";
 	try {
 		const response = await fetch("/api/publicreport-notification", {
 			method: "POST",
@@ -339,14 +353,15 @@ const handleSubmit = async () => {
 		});
 
 		if (response.ok) {
-			// Handle success (e.g., show a success message)
 			router.push(routes.RegisterNotificationsComplete(props.id));
 		} else {
-			// Handle error
-			console.error("Form submission failed");
+			errorMessage.value = "Something went wrong. Your request could not be completed. Please try again.";
 		}
 	} catch (error) {
-		console.error("Error submitting form:", error);
+		errorMessage.value =
+			error instanceof Error ? error.message : "Upload failed";
+	} finally {
+		isSubmitting.value = false;
 	}
 };