feat: full-screen StoryGallery with flow layout, startAtScene engine method, clickable flow nodes

src/App.vue

@@ -43,7 +43,7 @@ const showTopBar = ref(true)
 let hideTopBarTimer: ReturnType<typeof setTimeout> | null = null
 
 const { loadGame, start, resumeAutoSave, makeChoice, clickHotspot, startChapter,
-  skipScene, setSpeed, getSpeed, isSceneWatched,
+  skipScene, setSpeed, getSpeed, isSceneWatched, startAtScene,
   saveGame, loadGameFromSlot, refreshSaves, saveSystem, engine } =
   useGameEngine(() => [videoElA.value, videoElB.value])
 
@@ -363,6 +363,7 @@ init()
         :visited-ids="store.visitedSceneIds"
         :unlocked-chapter-ids="store.unlockedChapterIds"
         @start-chapter="(chId: string) => { showStoryGallery = false; onStartChapter(chId) }"
+        @start-at-scene="(chId: string, sceneId: string) => { showStoryGallery = false; started = true; startAtScene(chId, sceneId) }"
         @close="showStoryGallery = false"
       />
       <AchievementPanel