fix(editor): restore stable map editing behavior

src/data/world/environmentConfig.ts

@@ -1,4 +1,5 @@
 export const GAME_SCENE_SKY_MODEL_PATH = "/models/skybox/model.gltf";
+export const GAME_SCENE_SKY_FALLBACK_MODEL_PATH = "/models/sky/model.glb";
 export const GAME_SCENE_SKY_MODEL_SCALE = 100;
 export const GAME_SCENE_FALLBACK_BACKGROUND_COLOR = "#0b1018";
 export const PHYSICS_SCENE_BACKGROUND_COLOR = "#0b1018";

src/data/world/mapInstancingConfig.ts

@@ -81,7 +81,7 @@ export const MAP_INSTANCING_ASSETS = {
   },
 } as const;
 
-export const MAP_SINGLE_MODEL_SCALE_MULTIPLIERS = {
+const MAP_SINGLE_MODEL_SCALE_MULTIPLIERS = {
   ebike: 0.3,
 } as const satisfies Record<string, number>;
 
@@ -93,7 +93,7 @@ export function getMapSingleModelScaleMultiplier(name: string): number {
   );
 }
 
-export function getMapInstancedModelScaleMultiplier(name: string): number {
+function getMapInstancedModelScaleMultiplier(name: string): number {
   return (
     Object.values(MAP_INSTANCING_ASSETS).find(
       (config) => config.mapName === name,

src/data/world/terrainConfig.ts

@@ -3,7 +3,7 @@ import type { TerrainSurfaceColorConfig } from "@/types/world/terrainSurface";
 export const TERRAIN_MODEL_PATH = "/models/terrain/model.gltf";
 export const TERRAIN_WATER_HEIGHT = 0.8;
 
-export const TERRAIN_TILE_SIZE = 1;
+const TERRAIN_TILE_SIZE = 1;
 
 export const TERRAIN_COLORS = {
   grass1: {