Always show the name of the model within the Visual Editor

When you have multiple Builder tabs open, it's not always obvious which model you're working in.

For example, I have a header model, a footer model, and a page model. All three have the same preview URL. Unlike some customers, I don't add the model name to the content item title. Instead of "Default header," I'll call it simply "Default," because I find adding the model name redundant.

So now I have three tabs open to the exact same preview page, all three called "Default," all three pointing to different content items on different models.

It would go a long way to simply have the model name visible, perhaps in a faint gray color next to the content item title, such as "Default · Page".