fix: App.vue and useGameEngine refinements

src/App.vue

@@ -49,7 +49,7 @@ const showTopBar = ref(true)
 let hideTopBarTimer: ReturnType<typeof setTimeout> | null = null
 
 const { loadGame, start, resumeAutoSave, makeChoice, clickHotspot, startChapter,
-  skipScene, setSpeed, getSpeed, isSceneWatched, startAtScene,
+  skipScene, setSpeed, getSpeed, isSceneWatched, startAtScene, jumpToScene,
   saveGame, loadGameFromSlot, refreshSaves, saveSystem, engine } =
   useGameEngine(() => [videoElA.value, videoElB.value])
 
@@ -124,8 +124,7 @@ function handleStartFromScene(sceneId: string) {
   if (ch) {
     startAtScene(ch.id, sceneId)
   } else {
-    const scene = engine.sceneManager.getScene(sceneId)
-    if (scene) engine.goToScene(scene)
+    jumpToScene(sceneId)
   }
 }
 

src/composables/useGameEngine.ts

@@ -209,6 +209,12 @@ export function useGameEngine(videoEls: () => [HTMLVideoElement | null, HTMLVide
     engine.startAtScene(chapterId, sceneId)
   }
 
+  function jumpToScene(sceneId: string) {
+    ensureVideo()
+    const scene = engine.sceneManager.getScene(sceneId)
+    if (scene) engine.goToScene(scene)
+  }
+
   function skipScene() {
     engine.skipCurrentScene()
   }
@@ -288,7 +294,7 @@ export function useGameEngine(videoEls: () => [HTMLVideoElement | null, HTMLVide
     makeChoice,
     clickHotspot,
     startChapter,
-    startAtScene,
+    startAtScene, jumpToScene,
     skipScene,
     setSpeed,
     getSpeed,