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 Watch App/WatchAppServices.swift

@@ -36,9 +36,10 @@ final class WatchAppServices {
         self.sessionCoordinator = coordinator
         // weak break: the coordinator is held here; the bridge only borrows it.
         bridge.onWorkoutsChanged = { [weak coordinator] in coordinator?.reconcile() }
-        // Forward each live HR sample to a mirroring phone (best-effort, display-only).
-        // No cycle: the bridge never references the session manager back.
-        sessionManager.onHeartRateSample = { [bridge] bpm in bridge.sendLiveHeartRate(bpm) }
+        // Forward each live sample (HR + calories + zone) to a mirroring phone
+        // (best-effort, display-only). No cycle: the bridge never references the
+        // session manager back.
+        sessionManager.onHeartRateSample = { [bridge] sample in bridge.sendLiveSample(sample) }
         bridge.activate()
         // Seed `previouslyActiveIDs` from whatever the bridge already applied at launch, so the
         // first real change is measured against a correct baseline (and the launch race — a