refactor: extract enterScene as single source of truth for scene transitions

engine/core/Engine.ts

@@ -62,11 +62,6 @@ export class Engine {
   }
 
   private goToScene(scene: SceneNode) {
-    this.currentScene = scene
-    this.qteTriggered = false
-    this.qteResolved = false
-    this.loopActive = false
-
     const chapter = this.sceneManager.getChapterBySceneId(scene.id)
     if (chapter) {
       this.onUnlockChapter?.(chapter.id)
@@ -96,6 +91,15 @@ export class Engine {
       this.audioSystem.stop(scene.bgmCrossFade ?? 2.0)
     }
 
+    this.enterScene(scene)
+  }
+
+  private enterScene(scene: SceneNode) {
+    this.currentScene = scene
+    this.qteTriggered = false
+    this.qteResolved = false
+    this.loopActive = false
+
     if (scene.type === 'image') {
       this.justCameFromImage = true
       this.isInitialScene = false
@@ -380,34 +384,7 @@ export class Engine {
 
     this.ended = false
     this.isInitialScene = false
-    this.currentScene = scene
-
-    if (scene.type === 'image') {
-      this.emit('sceneChange', scene)
-      const visible = this.getVisibleHotspots(scene)
-      if (visible.length > 0) {
-        this.emit('hotspotRequest', visible)
-      }
-      return
-    }
-
-    const preloadUrls = this.sceneManager.getCandidateUrls(
-      scene,
-      (conds) => conds ? this.stateManager.evaluate(conds) : true
-    )
-
-    this.videoManager.onEnd(() => {
-      this.emit('videoEnd', scene)
-      this.onVideoEnd(scene)
-    })
-
-    const activeEl = this.videoManager.getActiveVideoElement()
-    activeEl?.pause()
-
-    this.videoManager.switchTo(scene.videoUrl, preloadUrls)
-
-    this.currentScene = scene
-    this.emit('sceneChange', scene)
+    this.enterScene(scene)
   }
 
   destroy() {