Implement timed-out submission handling and AJAX response for collection case view

atlas/views.py

@@ -2786,11 +2786,33 @@ def collection_case_view_take(
                                 raise Http404("Self review not enabled")
                             answer.completed = True
 
+                        # If this was a timed-out submission, mark as completed
+                        if request.POST.get('timed_out') == '1':
+                            answer.completed = True
+
                         answer.save()
 
                         cid_user_exam.end_time = timezone.now()
                         cid_user_exam.save()
 
+                        # If this was an AJAX/HTMX request, return JSON so the client
+                        # can remain on the same page and update the UI without redirect.
+                        # Detect HTMX/XHR requests robustly. HTMX sets the HX-Request header.
+                        is_ajax = (
+                            request.headers.get('HX-Request', '').lower() == 'true'
+                            or request.headers.get('x-requested-with') == 'XMLHttpRequest'
+                            or getattr(request, 'htmx', False)
+                        )
+                        if is_ajax:
+                            from django.http import JsonResponse
+                            return JsonResponse(
+                                {
+                                    'status': 'ok',
+                                    'locked': answer.completed,
+                                    'submitted_at': answer.submitted_at.isoformat() if getattr(answer, 'submitted_at', None) else None,
+                                }
+                            )
+
         if cid is not None:
             kwargs = {"pk": pk, "cid": cid, "passcode": passcode}
             redirect_url = "atlas:collection_case_view_take"