Redesign the floor plan editor with side-by-side layout featuring:
- Real-time isometric 3D preview that updates as tiles are drawn
- Vertical height gradient selector with COLORMAP colors
- Area counter showing total and walkable tile counts
- Zoom controls (+/-) on the 2D canvas
- Simplified single-row toolbar
- Wall height control in the preview panel
Co-Authored-By: medievalshell <medievalshell@users.noreply.github.com>
simoleo89