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/api/status_sensors.go

@@ -37,9 +37,9 @@ const statusHistory = 300
 // A point being averaged, the same idea as the sampler's: these sources are read every 15 to
 // 300 seconds, so a wide window keeps one point per stride rather than one per read.
 type bucket struct {
-	start int64
-	sum   float64
-	n     float64
+	last int64 // when this sensor's last point was kept
+	sum  float64
+	n    float64
 }
 
 const (
@@ -83,15 +83,16 @@ func (p *statusSensors) loop(name string, every time.Duration, read func(context
 			}
 			b := p.acc[x.ID]
 			if b == nil {
-				b = &bucket{start: x.T}
+				b = &bucket{}
 				p.acc[x.ID] = b
 			}
 			b.sum, b.n = b.sum+v, b.n+1
-			if x.T-b.start < stride && b.n > 1 {
+			// due a stride after the last point kept, with half a read of slack for a late timer
+			if b.last != 0 && x.T-b.last < stride-every.Milliseconds()/2 {
 				continue // still filling this point
 			}
 			h.T, h.V = append(h.T, x.T), append(h.V, b.sum/b.n)
-			*b = bucket{start: x.T + 1}
+			*b = bucket{last: x.T}
 			if len(h.T) > statusHistory {
 				h.T, h.V = h.T[len(h.T)-statusHistory:], h.V[len(h.V)-statusHistory:]
 			}