Add optional labels to maps in worlds

@Oval17 is already working on this.

Since Feb 20, 2026.

### Is your feature request related to a problem? Please describe.

When I'm creating levels for a game, it is usually done linearly. Sometimes though, I might find that a level I am creating works better earlier than it's intended. e.g. level 3 works better as level 2 and level should 2 should actually be level 3.

I then reorder them in the world file so I can visually see this but this isn't clear anywhere else.

### Describe the solution you'd like.

This reordering works however I can't visually tell anymore than level 3 is now level 2 and it's something I have to remember myself.

If there was kind of optional label above each, it would reduce the cognitive load.
Something like this:

My suggestion is to add `name` field to the map. This would be consistent with how objects currently display their names while in the map

### Describe alternatives you've considered.

Renaming the files is the obvious solution but I find this a bit clunky, it takes me out of the editing experience. It's also not very source-control friendly.