A probe now links to the backend like an agent (probe.json carries the
server address). The backend sends the agent list as desired state and the
probe reports its platform and build in its own hello. The agent no longer
relays the list or the probe platform. Existing probes must be re-created.
Acrylic cards and topbar over a blurred background, country flags, ISP and
OS icons, per-node version tags, a build info footer and an admin versions
tab. Overview cards drop the sparkline and widen the hover area.
justme