Wire the MazeNET editor to the new /topologies/{id}/events SSE route
so live (active|degraded) topologies reflect mutator state transitions
without reload:
- useTopologyStream hook opens an EventSource against
/topologies/{id}/events?token=<jwt>, with 3s reconnect matching the
dashboard's /stream consumer. Callback refs avoid tearing down the
connection on consumer rerenders.
- useMazeApi gains enqueueMutation(topologyId, op, payload,
expectedVersion?) — thin wrapper over POST /mutations.
- MazeNET.tsx opens the stream only when topoStatus is active|degraded
(pending editors have nothing to stream) and refetches on
mutation.applied|failed|status events. Header shows a LIVE /
CONNECTING… indicator.
Phase A slice — Apply (N changes) with an optimistic staged buffer
lands in a follow-up; the hooks + API method it'll need are already
here.