Improve level-up animation and unit audio assets

src/game/audio/SoundDirector.ts

@@ -99,6 +99,10 @@ class SoundDirector {
   }
 
   playLevelUp() {
+    if (this.playEffect('level-up', { volume: 0.36, stopAfterMs: 1200 })) {
+      return;
+    }
+
     this.playEffect('exp-gain', { volume: 0.42, rate: 1.08, stopAfterMs: 820 });
     this.playTone(520, 0.08, 0.035, 'triangle');
     window.setTimeout(() => this.playTone(720, 0.09, 0.04, 'triangle'), 82);

src/game/audio/audioAssets.ts

@@ -8,6 +8,7 @@ import combatImpactUrl from '../../assets/audio/sfx/combat-impact.mp3';
 import expGainUrl from '../../assets/audio/sfx/exp-gain.mp3';
 import footstepWalkUrl from '../../assets/audio/sfx/footstep-walk.mp3';
 import horseGallopUrl from '../../assets/audio/sfx/horse-gallop.mp3';
+import levelUpUrl from '../../assets/audio/sfx/level-up.wav';
 import strategyCastUrl from '../../assets/audio/sfx/strategy-cast.mp3';
 import swordSlashUrl from '../../assets/audio/sfx/sword-slash.mp3';
 import uiSelectUrl from '../../assets/audio/sfx/ui-select.mp3';
@@ -27,6 +28,7 @@ export const effectTracks = {
   'strategy-cast': strategyCastUrl,
   'cart-roll': cartRollUrl,
   'exp-gain': expGainUrl,
+  'level-up': levelUpUrl,
   'footstep-walk': footstepWalkUrl,
   'horse-gallop': horseGallopUrl
 } as const;