The per-cluster dot now reflects how the workload ended up after the
cluster's events, not the worst thing that happened inside it: if the
most recent state transition in the cluster was "-> healthy", the dot
turns green even when the cluster contains earlier degraded/warning
events. Falls back to the existing dominantSev logic for clusters
without any state transition (e.g. rollout-only clusters).
Matches the reality that a rollout which briefly degrades and then
recovers is a normal, healthy outcome — not a "warning" forever.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>