Report errors in the UI of client application

[esscardano]

When there is an error uploading/creating variables the application does not notify it. The only way to know actually is checking the devtools or refreshing the app to check the change was committed to the server. As a user, is critical to know if there is any failure because the application must be reliable. An alert or toast would be nice.

[danenania]

Thanks, we’ll improve the error handling here!