Art: Made all trees 40% smaller + apple tree simple 2D flat style

src/systems/ChunkManager.js

@@ -3,6 +3,7 @@ class ChunkManager {
     constructor(scene, chunkSize = 50) {
         this.scene = scene;
         this.chunkSize = chunkSize; // 50x50 tiles per chunk
+        this.biomeSystem = null; // Will be set by GameScene
 
         // Active chunks (currently loaded)
         this.activeChunks = new Map(); // Key: "chunkX,chunkY", Value: chunk data
@@ -67,8 +68,8 @@ class ChunkManager {
 
                 // Get biome for this tile
                 let biomeId = 'grassland';
-                if (this.scene.biomeSystem) {
-                    biomeId = this.scene.biomeSystem.getBiomeAt(worldX, worldY);
+                if (this.biomeSystem) {
+                    biomeId = this.biomeSystem.getBiomeAt(worldX, worldY);
                 }
 
                 chunk.tiles.push({