[codex] Propagate total kcal to Apple Watch

[cagnulein]

Summary

Fixes #4723 by carrying total kcal through the iPhone/iPad to Apple Watch data path.

Changes

• Include totalKcal in the iPhone WatchConnectivity reply used by the watch app.
• Parse TOTALKCAL= from the iPad relay message into WatchKitConnection.totalKcal.
• Copy the received watch-side totalKcal into WorkoutTracking.totalKcal so the existing HealthKit workout save logic can write totalEnergyBurned separately from active kcal.

Validation

• Ran git diff --check on the modified files.
• iOS/watchOS build was not run in this Linux environment.

[cagnulein]

Follow-up added for the Live Activity heart-rate issue shown in the screenshots.

Root cause: workoutTrackingUpdate used a single heartRate argument for both HealthKit workout samples and the Live Activity. When HR came from HealthKit/Apple Watch, QZ intentionally passed 0 to avoid writing a duplicate HR sample back into HealthKit; the lock-screen Live Activity then displayed that same 0, while Dynamic Island compact could still show the configured compact metric value.

Fix: split the values so HealthKit workout tracking can still receive 0 for watch-sourced HR, while Live Activity receives the actual current HR.