Ports events.ts's CatalogStore and connections.ts's ConnectionPool to
Zustand stores (src/stores/catalogStore.ts, connectionStore.ts) built
via factory functions so tests can inject fake sockets/schedulers, same
as the originals. Reconnect/backoff schedule, the 6-max-parked LRU, and
the #140 view-reconciliation race handling all carry over unchanged.
The vanilla events.ts/connections.ts stay in place for the current app;
this is prep for the React port (#241).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
