fix(wizard): drop data field from create_edge ops

EA2 server rejects data on create_edge with extra_forbidden despite the
OpenAPI schema marking it optional. flow_key is implicit from the node refs.

src/lib/wizardApi.ts

@@ -130,14 +130,14 @@ export const wizardApi = {
         data: { _key, flow_key: flowKey, ...rest },
       };
     },
-    createEdge(flowKey: string, fromKey: string, toKey: string, role = "next"): CreateEdgeOp {
+    createEdge(_flowKey: string, fromKey: string, toKey: string, role = "next"): CreateEdgeOp {
+      // EA2 server rejects `data` on create_edge despite the OpenAPI schema marking it optional.
       return {
         op: "create_edge",
         edge_coll: "ea2_edge",
         from: `ea2_node/${fromKey}`,
         to: `ea2_node/${toKey}`,
         role,
-        data: { flow_key: flowKey },
       };
     },
     publishFlow(flowKey: string): UpdateOp {