Launch the watch from the exercise-list start path too

The "Start This Split" button on a split's exercise list minted and
saved the workout but never called WorkoutLauncher, so the Apple Watch
never came up when starting from there — only the home-screen split
picker launched it. Inject AppServices into ExerciseListView and call
launchWatchWorkout from start(), mirroring the picker path.

Claude-Session: https://claude.ai/code/session_01PVNBVKp5bcq52X722uMjwT

Workouts/Views/Exercises/ExerciseListView.swift

@@ -13,6 +13,7 @@ import SwiftData
 
 struct ExerciseListView: View {
     @Environment(SyncEngine.self) private var sync
+    @Environment(AppServices.self) private var services
     @Environment(\.dismiss) private var dismiss
 
     // Resolve the split by id, not a captured entity: editing a seed's exercise from
@@ -221,6 +222,9 @@ struct ExerciseListView: View {
             await sync.save(workout: doc)
             pendingWorkoutID = doc.id
         }
+        // Bring the Apple Watch up into the session so the user can run it from the wrist,
+        // tagged with the split's activity type — mirroring the split-picker start path.
+        services.workoutLauncher.launchWatchWorkout(activityType: split.activityTypeEnum.hkActivityType)
     }
 
     private func addExercises(names: [String]) {