Dockhand aggregates containers across every Docker host it manages
into one list, with no way to narrow it down to a single host. Add a
host dropdown next to Refresh (only shown when more than one host is
present) that filters the table client-side over the already-fetched
container list. Resets whenever the selected Dockhand integration
changes, so a stale host name from a previous integration can't linger.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>