Add a live status panel between the run screen's halves

Replaces the small target-HR pill on the iPhone run screen with a
glanceable big-digit strip between the timer flow and the figure —
heart rate (band-tinted with the cue arrow when the run carries a
target), HR zone, active calories, and the workout stopwatch. A
horizontal band in portrait, a vertical column in landscape (the
inverse of the half-and-half split, so it always sits between them).

The watch now rides the running calorie total and the HR zone (1-5,
computed watch-side where max HR is known) along with each live HR
sample; absent keys keep older builds wire-compatible both ways.
LiveRunState holds all three under the shared staleness expiry. The
screenshot rig seeds believable values so the run capture shows the
panel populated.

Workouts/Connectivity/PhoneConnectivityBridge.swift

@@ -269,7 +269,9 @@ final class PhoneConnectivityBridge: NSObject {
             }
         case WCPayload.liveHeartRateType:
             if let sample = WCPayload.decodeLiveHeartRate(dict) {
-                Task { @MainActor in self.liveRunState.applyHeartRate(sample.bpm) }
+                Task { @MainActor in
+                    self.liveRunState.applyLiveSample(bpm: sample.bpm, kcal: sample.kcal, zone: sample.zone)
+                }
             }
         default:
             break