Custom naming for multiple comfyUI instances

### Feature Idea

A lot of Comfyui users, use comfyui in active development, in such escenarios is rather normal to have several instances of comfyui totally independent from each other (living in different folders) coexsiting. In our case we have almost a dozen instances.
So when you launch those services, the only way to know in which instance you are working is the port number, and that's not good, specially for artists and testers.

We would need a way to add a customized name or (icon) color to the tab and the visible top header within the UI, maybe next to "comfyUI" at the top left.
That should do it.

If you want to go the extra mile, having a custom color for the background of each instance would be great.

### Existing Solutions

AFAIK there is no easy, maintainable, way of doing it.

### Other

_No response_