Lift every read- and write-side data flow off the page shell:
GET /system/deployment-mode (decides which list endpoint to hit)
GET /deckies | /swarm/deckies (mode-switched + shape-normalized)
GET /config (role -> isAdmin)
GET /topologies/archetypes (live catalog with bundled fallback)
POST /deckies/:name/mutate
PUT /deckies/:name/mutate-interval
POST /swarm/hosts/:uuid/teardown
10s polling loop refreshing mode + list
Operations return discriminated results ({ok:true} | {ok:false,
reason:...}) so the page can branch toast tone without seeing the
axios error type. Toasts, arm-confirm, and modal visibility stay
in the consuming page — the hook is pure data.
- New DeckyFleet/useDeckyFleet.ts
- useDeckyFleet.test.ts MSW-covers initial load, swarm-mode shape
normalization, mutate ok/error paths, teardown ok path, and
applyServicesChange optimistic write.
- DeckyFleet.tsx wiring lands in the next commit so the diff stays
reviewable.