Top wears the skin; the refresh rate reaches every machine; bug bash 4

The process table's columns fit the box they are in, the rate control saves, curves are
timed on the viewer's clock and keep to the stride, the power icon is drawn, and a young
history draws in from the right instead of being stretched.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/store/store.go

@@ -22,6 +22,7 @@ type State struct {
 	Dashboard  json.RawMessage      `json:"dashboard,omitempty"`   // UI layout prefs, opaque to the server
 	UI         json.RawMessage      `json:"ui,omitempty"`          // theme etc., opaque to the server
 	Alerts     json.RawMessage      `json:"alerts,omitempty"`      // rules, channels and recent events (internal/api/alerts.go)
+	SamplerMs  int                  `json:"sampler_ms,omitempty"`  // how often this machine samples; the hub keeps every machine on the console's refresh rate
 	HistorySec int                  `json:"history_sec,omitempty"` // how far back the graphs reach; the hub keeps every machine on the same one
 }