Align CMS title fallbacks and mutation error handling.

Add blog post untitled helper, use product title helper in order views, and surface API validation messages on product save/delete.

cms/src/components/OrderCartPanel.vue

@@ -15,7 +15,7 @@
                                 target="_blank"
                                 rel="noopener"
                             >
-                                {{ row.productTitle }}
+                                {{ getProductTitle(row.productTitle) }}
                             </router-link>
                         </template>
                     </el-table-column>
@@ -113,6 +113,7 @@ import type { OrderExtended } from '@/types/order/OrderExtended';
 import { DeliveryMode } from '@/types/product/DeliveryMode';
 import { formatDeliveryMode } from '@/utils/product/formatDeliveryMode';
 import { formatFiatPrice } from '@/utils/formatFiatPrice';
+import { getProductTitle } from '@/utils/product/getProductTitle';
 import { resolveAxiosErrorMessage } from '@/utils/resolveAxiosErrorMessage';
 
 const props = defineProps({
@@ -143,7 +144,7 @@ const openAutoDelivery = (line: OrderLine): void => {
 const markAsFulfilled = async (line: OrderLine): Promise<void> => {
     try {
         await ElMessageBox.confirm(
-            `Mark "${line.productTitle}" (${line.variantTitle}) as fulfilled? This cannot be undone.`,
+            `Mark "${getProductTitle(line.productTitle)}" (${line.variantTitle}) as fulfilled? This cannot be undone.`,
             'Mark as fulfilled',
             {
                 type: 'warning',