chore: engine, types, demo, and UI updates

engine/core/Engine.ts

@@ -78,7 +78,7 @@ export class Engine {
     this.goToScene(startScene)
   }
 
-  private goToScene(scene: SceneNode) {
+  public goToScene(scene: SceneNode) {
     this.currentScene = scene
 
     const chapter = this.sceneManager.getChapterBySceneId(scene.id)
@@ -282,6 +282,11 @@ export class Engine {
 
     if (this.loopActive) return
 
+    if (scene.battleResult) {
+      this.emit('battleResultRequest', scene.battleResult)
+      return
+    }
+
     const validChoices = this.getValidChoices(scene)
 
     if (validChoices.length > 0) {

engine/types.ts

@@ -157,6 +157,7 @@ export type EngineEvent =
   | 'hotspotUpdate'
   | 'chapterUnlock'
   | 'achievementUnlock'
+  | 'battleResultRequest'
 
 export interface PlayerTreeNode {
   sceneId: string