feat: implement quiz results tracking and caching for user tests

src/pages/Leren.jsx

@@ -7,6 +7,7 @@ import Button from '../components/ui/Button';
 import Tag from '../components/ui/Tag';
 import { useApp } from '../store/AppContext';
 import { getAssignedTopic } from '../lib/learningService';
+import { generateWeeklyQuiz } from '../lib/testService';
 import { getYearProgress, getCurriculumCycle, getCurriculumWeek, getActiveVersion, getCurrentWeekContent } from '../lib/curriculumService';
 import * as db from '../lib/db';
 import MicroLearningSelector from '../components/micro_learning/MicroLearningSelector';
@@ -86,6 +87,13 @@ const Leren = () => {
 
   const handleTopicCompleted = () => {
     setSessionDone(true);
+    // Pre-generate this week's test questions in the background so they are
+    // ready in localStorage by the time the user navigates to /test. The call
+    // is fire-and-forget — a failure here is harmless; the test page will just
+    // generate on demand as before.
+    if (state.currentUser) {
+      generateWeeklyQuiz(state.currentUser.id, state.weekNumber).catch(() => {});
+    }
   };
 
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