Add WatchConnectivity for bidirectional iOS-Watch sync

Implement real-time sync between iOS and Apple Watch apps using
WatchConnectivity framework. This replaces reliance on CloudKit
which doesn't work reliably in simulators.

- Add WatchConnectivityManager to both iOS and Watch targets
- Sync workouts, splits, exercises, and logs between devices
- Update iOS views to trigger sync on data changes
- Add onChange observer to ExerciseView for live progress updates
- Configure App Groups for shared container storage
- Add Watch app views: WorkoutLogsView, WorkoutLogListView, ExerciseProgressView

Workouts/Views/WorkoutLogs/ExerciseView.swift

@@ -125,6 +125,14 @@ struct ExerciseView: View {
         .onAppear {
             progress = Int(workoutLog.currentStateIndex)
         }
+        .onChange(of: workoutLog.currentStateIndex) { _, newValue in
+            // Update local state when CoreData changes (e.g., from Watch sync)
+            if progress != Int(newValue) {
+                withAnimation(.easeInOut(duration: 0.2)) {
+                    progress = Int(newValue)
+                }
+            }
+        }
     }
 
     private func updateLogStatus() {
@@ -162,6 +170,7 @@ struct ExerciseView: View {
 
     private func saveChanges() {
         try? viewContext.save()
+        WatchConnectivityManager.shared.syncAllData()
     }
 }
 

Workouts/Views/WorkoutLogs/NotesEditView.swift

@@ -48,5 +48,6 @@ struct NotesEditView: View {
     private func saveChanges() {
         workoutLog.notes = notesText
         try? viewContext.save()
+        WatchConnectivityManager.shared.syncAllData()
     }
 }

Workouts/Views/WorkoutLogs/PlanEditView.swift

@@ -163,5 +163,6 @@ struct PlanEditView: View {
         }
 
         try? viewContext.save()
+        WatchConnectivityManager.shared.syncAllData()
     }
 }

Workouts/Views/WorkoutLogs/WorkoutLogListView.swift

@@ -133,12 +133,14 @@ struct WorkoutLogListView: View {
         }
         updateWorkoutStatus()
         try? viewContext.save()
+        WatchConnectivityManager.shared.syncAllData()
     }
 
     private func completeLog(_ log: WorkoutLog) {
         log.status = .completed
         updateWorkoutStatus()
         try? viewContext.save()
+        WatchConnectivityManager.shared.syncAllData()
     }
 
     private func updateWorkoutStatus() {
@@ -164,6 +166,7 @@ struct WorkoutLogListView: View {
             log.order = Int32(index)
         }
         try? viewContext.save()
+        WatchConnectivityManager.shared.syncAllData()
     }
 
     private func addExerciseFromSplit(_ exercise: Exercise) {
@@ -188,6 +191,7 @@ struct WorkoutLogListView: View {
         log.workout = workout
 
         try? viewContext.save()
+        WatchConnectivityManager.shared.syncAllData()
 
         // Navigate to the new exercise view
         newlyAddedLog = log

Workouts/Views/WorkoutLogs/WorkoutLogsView.swift

@@ -88,6 +88,7 @@ struct WorkoutLogsView: View {
                         withAnimation {
                             viewContext.delete(item)
                             try? viewContext.save()
+                            WatchConnectivityManager.shared.syncAllData()
                             itemToDelete = nil
                         }
                     }
@@ -167,11 +168,17 @@ struct SplitPickerSheet: View {
             workoutLog.sets = exercise.sets
             workoutLog.reps = exercise.reps
             workoutLog.weight = exercise.weight
+            workoutLog.loadType = exercise.loadType
+            workoutLog.duration = exercise.duration
             workoutLog.status = .notStarted
             workoutLog.workout = workout
         }
 
         try? viewContext.save()
+
+        // Sync to Watch
+        WatchConnectivityManager.shared.syncAllData()
+
         dismiss()
     }
 }