Add functionality to filter exam collections by archived status

generic/views.py

@@ -5342,8 +5342,15 @@ class ExamCollectionList(ListView):
     
     def get_queryset(self):
         """Annotate exam counts per collection and prefetch authors to avoid N+1 queries in templates."""
+        # allow toggling whether archived collections are included via ?show_archived=1
+        show_archived = self.request.GET.get("show_archived")
+
+        base_qs = ExamCollection.objects.all()
+        if not show_archived:
+            base_qs = base_qs.filter(archive=False)
+
         qs = (
-            ExamCollection.objects.all()
+            base_qs
             .annotate(
                 anatomy_count=Count("anatomy_exams", filter=Q(anatomy_exams__archive=False)),
                 longs_count=Count("longs_exams", filter=Q(longs_exams__archive=False)),