When disabling offline alerts for VMs/containers, the setting was being persisted
correctly and honored by the alert system, but the UI always showed "Warn" instead
of the actual saved state.
Root cause: When reconstructing the overrides list from backend config, the guest
override mapping was copying poweredOffSeverity but omitting disableConnectivity,
causing ResourceTable to fall back to global defaults.
Fix: Add disableConnectivity field to guest override reconstruction in Alerts.tsx
(line 676), matching the pattern already used for Docker containers.
bb6ea3b23c