- Dispose Monaco editor instances on dialog close to prevent cycle leak
- Replace gcTime: Infinity with finite TTLs and evict orphaned subscription queryKeys
- Add missing useEffect cleanup for timers, move setTimeout out of useMemo
Replace swr with @tanstack/react-query v5 across all hooks, providers,
and components. Introduce singleton QueryClient, WS subscription pattern
via useQuery+useEffect, and enforce component-layer cache access contract.