Remove the buried Start This Split button from the exercise editor

ExerciseListView is reached only via Settings > Splits > split > Edit >
Exercises, so its toolbar start button was effectively undiscoverable and
duplicated the home-screen split picker (the sole remaining start path).
Strip the button and its now-dead start flow: the active-workout prompt,
end-and-restart handling, started-workout navigation, and the AppServices
dependency. Also drop the changelog entry for the watch-launch wiring of
that button (f01e149) since the button no longer exists and never shipped.

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

CHANGELOG.md

@@ -2,8 +2,6 @@
 
 A new Cardio exercise and matching starter split let you log aerobic sessions, tracked on your Apple Watch as a cardio workout.
 
-Starting a workout with a split's Start This Split button now brings it up on your Apple Watch too, matching how starting one from the main list already worked.
-
 A new Auto-Advance option lets a split flow hands-free from one exercise to the next, resting automatically between them.
 
 Each split can now set its own rest time, overriding the app-wide default in Settings.

Workouts/Views/Exercises/ExerciseListView.swift

@@ -13,7 +13,6 @@ 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
@@ -25,15 +24,6 @@ struct ExerciseListView: View {
     @State private var showingAddSheet: Bool = false
     @State private var itemToEdit: Exercise? = nil
     @State private var itemToDelete: Exercise? = nil
-    /// ID of the just-created workout; drives programmatic navigation once the
-    /// cache observer delivers the entity a beat after the file write (see
-    /// `navigatesToStartedWorkout`).
-    @State private var pendingWorkoutID: String? = nil
-
-    @Query(sort: \Workout.start, order: .reverse)
-    private var workouts: [Workout]
-
-    @State private var showingActivePrompt = false
     @AppStorage("weightUnit") private var weightUnit: WeightUnit = .lb
 
     init(split: Split) {
@@ -45,10 +35,6 @@ struct ExerciseListView: View {
         return splits.first { $0.id == id }
     }
 
-    private var activeWorkouts: [Workout] {
-        workouts.filter { $0.status == .inProgress || $0.status == .notStarted }
-    }
-
     var body: some View {
         Group {
             if let split {
@@ -58,8 +44,6 @@ struct ExerciseListView: View {
                     .task { dismiss() }
             }
         }
-        // Navigate into the workout's log screen once the entity appears in the cache.
-        .navigatesToStartedWorkout(pendingWorkoutID: $pendingWorkoutID)
     }
 
     @ViewBuilder
@@ -103,14 +87,6 @@ struct ExerciseListView: View {
             }
         }
         .navigationTitle(split.name)
-        .toolbar {
-            ToolbarItem(placement: .primaryAction) {
-                Button("Start This Split") {
-                    confirmAndStart()
-                }
-                .disabled(split.exercisesArray.isEmpty)
-            }
-        }
         .sheet(isPresented: $showingAddSheet) {
             ExercisePickerView(onExerciseSelected: { exerciseNames in
                 addExercises(names: exerciseNames)
@@ -138,53 +114,10 @@ struct ExerciseListView: View {
         } message: { item in
             Text("Remove \"\(item.name)\" from this split?")
         }
-        .confirmationDialog(
-            activePromptTitle,
-            isPresented: $showingActivePrompt,
-            titleVisibility: .visible
-        ) {
-            Button("End Current & Start New") { endActiveThenStart() }
-            Button("Start in Parallel") { start() }
-            Button("Cancel", role: .cancel) { showingActivePrompt = false }
-        } message: {
-            Text(activePromptMessage)
-        }
     }
 
     // MARK: - Helpers
 
-    private var activePromptTitle: String {
-        activeWorkouts.count == 1 ? "Workout in Progress" : "\(activeWorkouts.count) Workouts in Progress"
-    }
-
-    private var activePromptMessage: String {
-        let n = activeWorkouts.count
-        let those = n == 1 ? "it" : "them"
-        return "You already have \(n == 1 ? "a workout" : "\(n) workouts") going. End \(those) first, or run this one alongside."
-    }
-
-    /// Prompt before starting if other workouts are still going; otherwise start straight away.
-    private func confirmAndStart() {
-        if activeWorkouts.isEmpty {
-            start()
-        } else {
-            showingActivePrompt = true
-        }
-    }
-
-    /// End every in-flight workout (keeping its progress), then start this split.
-    private func endActiveThenStart() {
-        let toEnd = activeWorkouts.map { WorkoutDocument(from: $0) }
-        showingActivePrompt = false
-        Task {
-            for var doc in toEnd {
-                doc.endKeepingProgress()
-                await sync.save(workout: doc)
-            }
-        }
-        start()
-    }
-
     private func moveExercises(from source: IndexSet, to destination: Int) {
         guard let split else { return }
         var exercises = split.exercisesArray
@@ -199,34 +132,6 @@ struct ExerciseListView: View {
         Task { await sync.save(split: doc) }
     }
 
-    private func start() {
-        guard let split else { return }
-        let startDate = Date()
-        let logs = split.exercisesArray.enumerated().map { i, ex in
-            WorkoutLogDocument(planFrom: ExerciseDocument(from: ex), order: i, date: startDate)
-        }
-        let doc = WorkoutDocument(
-            schemaVersion: WorkoutDocument.currentSchemaVersion,
-            id: ULID.make(),
-            splitID: split.id,
-            splitName: split.name,
-            start: startDate,
-            end: nil,
-            status: WorkoutStatus.notStarted.rawValue,
-            createdAt: startDate,
-            updatedAt: startDate,
-            logs: logs,
-            restSeconds: split.restSeconds, autoAdvance: split.autoAdvance
-        )
-        Task {
-            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]) {
         guard let split else { return }
         var doc = SplitDocument(from: split)