Add unit tests for State methods (internal/models)
51 test cases covering Docker host and generic Host state management:
- UpsertDockerHost, RemoveDockerHost, GetDockerHosts
- SetDockerHostStatus, SetDockerHostHidden, SetDockerHostPendingUninstall
- SetDockerHostCommand, SetDockerHostCustomDisplayName
- TouchDockerHost, RemoveStaleDockerHosts
- AddRemovedDockerHost, RemoveRemovedDockerHost, GetRemovedDockerHosts
- UpsertHost, GetHosts, RemoveHost, SetHostStatus, TouchHost
- UpdateRecentlyResolved
Coverage 44.0% → 68.3%.