Replace the static SVG fleet topology with a ReactFlow canvas laid out
via dagre. Each node renders as a rack card with status pill, type
badge, CPU/MEM/DISK bars, and stack/running counts. Pan, zoom, drag,
and minimap are enabled; user-dragged positions persist across the
30-second poll so live metric updates no longer reset layout.
Introduce a status masthead above the node grid summarising fleet-wide
CPU, memory, container, and alert counts with a coloured rail that
reflects overall health. Pin the local node at the top of the grid with
a cyan accent rail and a Local badge so it is never confused with a
remote. Add a Topology view toggle that plots the local node on the
left with remotes radiating out, and colour-codes connector lines by
link health.
Anso