chore: establish learning module baseline

OpenMAIC/components/edit/scene-timeline.ts

@@ -0,0 +1,17 @@
+import type { SceneType } from '@/lib/types/stage';
+
+/**
+ * The narration timeline (ActionsBar) is decoupled from the canvas editor
+ * surface. It applies wherever a spoken script makes sense: scene types with a
+ * registered editor surface (slide/quiz), PLUS view-only-canvas scenes that
+ * still carry narration (interactive/pbl). Mirrors how the AI edit panel
+ * (agentEnabled) is decoupled from the canvas surface in EditChromeRoot.
+ */
+const NARRATION_ONLY_TYPES: ReadonlySet<SceneType> = new Set(['interactive', 'pbl']);
+
+export function supportsNarrationTimeline(
+  sceneType: SceneType,
+  hasRegisteredSurface: boolean,
+): boolean {
+  return hasRegisteredSurface || NARRATION_ONLY_TYPES.has(sceneType);
+}