fix: show dialog on offline operation failure

Author: wtrocki

src/app/services/sync/voyager.service.ts

@@ -63,7 +63,16 @@ export class VoyagerService {
     const options: DataSyncConfig = {
       conflictListener: new ConflictLogger(this.alertCtrl),
       fileUpload: true,
-      mutationCacheUpdates: taskCacheUpdates
+      mutationCacheUpdates: taskCacheUpdates,
+      offlineQueueListener: {
+        onOperationFailure: (operation) => {
+          this.alertCtrl.create({
+            message: `Failed to replicate offline change: ${operation.operationName}`
+          }).then((dialog) => {
+            dialog.present();
+          });
+        }
+      }
     };
 
     if (!this.openShift.hasSyncConfig()) {