Lift the canvas data plane off the page shell. The hook owns:
GET /topologies/:id (hydrates nets/nodes/edges + meta)
GET services + archetypes (catalogs, with bundled fallback)
POST /topologies/:id/deploy
/topologies/:id/events SSE (open only when active/degraded)
flashErr() banner timer (auto-clears actionErr after 4s)
State setters for nets / nodes / edges are returned so the
per-operation callbacks living in the page can optimistically
patch local state alongside their REST calls (matches the
existing pattern; wholesale lift would mean dragging every
mutation along too).
- New MazeNET/useTopologyData.ts
- useTopologyData.test.ts covers hydrate, loadErr surfacing,
streamEnabled gating on active/degraded, onDeploy success +
error paths, and the flashErr 4s auto-clear with fake timers.
- Wiring into MazeNET.tsx lands in the next commit.
anti
5f2a3f4629