Checkpoint React frontend migration

backend/tests/test_route_wiring.py

@@ -0,0 +1,11 @@
+from pathlib import Path
+import sys
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+
+from app.main import app
+
+
+def test_next_item_route_is_registered():
+    paths = set(app.openapi()["paths"])
+    assert "/api/v1/session/{session_id}/next_item" in paths