novo fix

frontend/src/routes/QuizPage.tsx

@@ -1,6 +1,6 @@
 import { useEffect, useRef, useState } from "react";
 import { api, type Structure, type QuizCard } from "../lib/api.js";
-import { useAllStructures } from "../hooks/useStructures.js";
+import { useSystemStructures } from "../hooks/useSystemStructures.js";
 import { Scene } from "../components/viewer/Scene.js";
 import { LayerToggle } from "../components/LayerToggle.js";
 import { useAtlasStore } from "../store/useAtlasStore.js";
@@ -8,7 +8,8 @@ import { useAtlasStore } from "../store/useAtlasStore.js";
 type Deck = (Structure & { quizCard: QuizCard | null })[];
 
 export default function QuizPage() {
-  const { bySlug } = useAllStructures();
+  const visibleSystems = useAtlasStore((s) => s.visibleSystems);
+  const { bySlug } = useSystemStructures(visibleSystems);
   const [deck, setDeck] = useState<Deck>([]);
   const [index, setIndex] = useState(0);
   const [feedback, setFeedback] = useState<"correct" | "wrong" | null>(null);