Add isometric 3D map view for Genesis City

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

Genesis City currently only offers a flat 2D map, which limits users' spatial understanding of the environment. An isometric 3D view would give a richer, more intuitive sense of the city layout and points of interest.

### Describe the solution you'd like

Introduce an isometric 3D map view for Genesis City, either as a replacement for or a toggle alongside the existing flat 2D map. Optionally, extend the same view to Worlds.

Key considerations:
- Rendering approach: pre-baked isometric tiles vs. real-time 3D scene capture.
- LOD and performance: the map covers a large area, so aggressive LOD and culling will be needed.
- UX: toggle or separate tab to switch between 2D and isometric 3D views.

### Describe alternatives you've considered

- Keeping the flat 2D map as the default with an opt-in toggle to switch to the isometric view.
- A height-map overlay on the existing 2D map as a lighter intermediate step.

### Additional context

- Related open issues:
- #9058 — Map | Genesis Plaza missing buildings and theatre on map view (existing 2D map gaps to address alongside or before the 3D view).
- #9175 — [TECH DEBT] MapRenderer | find base variable solution (MapRenderer foundation relevant to this effort).
- Supersedes the isometric map portion of #9542 (closed — split into focused issues).

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Reported by Dawid Krajewski and users
Requested by Stoyan Tsekov (<@U049A6A1324>)