Add case jump functionality with HTMX support and corresponding template

atlas/views.py

@@ -1134,6 +1134,46 @@ def collection_options(request):
     html = render_to_string("atlas/partials/collection_options.html", {"collections": collections}, request=request)
     return HttpResponse(html)
 
+
+@login_required
+def collection_case_jump_partial(request, pk: int):
+    """Return an HTMX partial containing a jump list for cases in the collection.
+
+    Expects optional GET params:
+      - current: the current case index (0-based) to mark active
+      - cid, passcode: optional candidate identifiers so links include them when present
+    """
+    # Allow non-HTMX callers to still get the fragment (useful for testing)
+    collection = get_object_or_404(CaseCollection, pk=pk)
+
+    casedetails = (
+        CaseDetail.objects.filter(collection=collection)
+        .select_related('case')
+        .order_by('sort_order')
+    )
+
+    try:
+        current = int(request.GET.get('current', 0) or 0)
+    except Exception:
+        current = 0
+
+    cid = request.GET.get('cid')
+    passcode = request.GET.get('passcode')
+
+    html = render_to_string(
+        'atlas/partials/_collection_case_jump.html',
+        {
+            'collection': collection,
+            'casedetails': casedetails,
+            'current': current,
+            'cid': cid,
+            'passcode': passcode,
+        },
+        request=request,
+    )
+
+    return HttpResponse(html)
+
 @login_required
 def remove_cases_from_collection(request):
     if not request.htmx: