feat: drop clues on correct guesses #fe

frontend/src/js/clue.ts

@@ -43,6 +43,17 @@ class Clue extends Phaser.GameObjects.Sprite {
       duration: 100,
     });
   }
+
+  delete() {
+    this.scene.tweens.add({
+      targets: this,
+      alpha: 0,
+      ease: "Linear",
+      delay: 0,
+      duration: 500,
+    });
+    this.destroy();
+  }
 }
 
 export default Clue;

frontend/src/js/fight_scene.ts

@@ -185,13 +185,14 @@ export default class FightScene extends Phaser.Scene {
     });
   }
 
-  shootSpear(enemy: Phaser.GameObjects.Sprite, hit: boolean) {
+  shootSpear(enemy: Critter, hit: boolean) {
     const scene = this;
     if (!hit) {
       this.showMissMessage();
     } else {
       this.showHitMessage();
       // TODO: ew.
+      enemy.clue.delete();
       scene.foes.splice(scene.foes.indexOf(enemy), 1); // FIXME
     }