Add music and voice assets

src/game/scenes/BattleScene.ts

@@ -1,4 +1,5 @@
 import Phaser from 'phaser';
+import { soundDirector } from '../audio/SoundDirector';
 import { firstBattleMap, firstBattleUnits, type TerrainType, type UnitData } from '../data/scenario';
 import { palette } from '../ui/palette';
 
@@ -24,6 +25,8 @@ export class BattleScene extends Phaser.Scene {
 
   create() {
     const { width, height } = this.scale;
+    soundDirector.stopVoice();
+    soundDirector.playMusic('battle-prep');
     this.add.rectangle(0, 0, width, height, 0x0f1418).setOrigin(0);
     this.drawMap();
     this.drawUnits();