feat: wire infinite chunk streaming into Game with loading screen

World/WorldGen/WorldGenerator.cs

@@ -23,6 +23,8 @@ public sealed class WorldGenerator
         this._terrain = new TerrainSampler(noise, this._biomeMap);
     }
 
+    public int SurfaceHeightAt(int worldX, int worldZ) => this._terrain.HeightAt(worldX, worldZ);
+
     public VoxelChunk Generate(Vector3i chunkPos)
     {
         VoxelChunk chunk = new();