Adding splitter between designer and properties

src/components/workflows/WorkflowsApp.py

@@ -61,4 +61,11 @@ def post(session, _id: str, from_id: str, to_id: str):
   logger.debug(
     f"Entering {Routes.AddConnection} with args {debug_session(session)}, {_id=}, {from_id=}, {to_id=}")
   instance = InstanceManager.get(session, _id)
-  return instance.add_connection(from_id, to_id)
+  return instance.add_connection(from_id, to_id)
+
+@rt(Routes.ResizeDesigner)
+def post(session, _id: str, designer_height: int):
+  logger.debug(
+    f"Entering {Routes.ResizeDesigner} with args {debug_session(session)}, {_id=}, {designer_height=}")
+  instance = InstanceManager.get(session, _id)
+  return instance.set_designer_height(designer_height)