fix(story): harden notebook interaction and fallback

app/components/cinematic/HeroScene.tsx

@@ -103,7 +103,13 @@ function CameraRig() {
   return null;
 }
 
-export default function HeroScene({ variant }: { variant?: HeroSceneVariant }) {
+export default function HeroScene({
+  variant,
+  isVisible = true,
+}: {
+  variant?: HeroSceneVariant;
+  isVisible?: boolean;
+}) {
   void variant;
   return (
     <div
@@ -113,6 +119,7 @@ export default function HeroScene({ variant }: { variant?: HeroSceneVariant }) {
       <Canvas
         camera={{ position: [0, 0.5, 8], fov: 60, near: 0.1, far: 100 }}
         dpr={[1, 1.5]}
+        frameloop={isVisible ? "always" : "never"}
         gl={{
           antialias: false,
           alpha: true,