Add machine comfort settings and tighten the document schemas

Machine-based exercises now carry ordered name/value comfort settings
(seat height, back-rest position, ...) on both ExerciseDocument and, as a
plan-time snapshot, WorkoutLogDocument — the optional array doubles as the
machine flag. Editable from the exercise editor's new Machine section and
from the workout row's settings sheet, whose mid-workout edits write back
to the originating split (workout saved first, so seed clone-on-edit
repointing can't clobber the log edit).

Schema tightening rides the same rev: splits bump to v2 (weight-reminder
fields and the unused exercise category removed), workouts to v3 (the
derived `completed` flag removed; status is the single source). Starter
seeds regenerated at v2 with unchanged ULIDs; SwiftData cache schema
bumped to rebuild. SCHEMA.md documents the shapes.

Claude-Session: https://claude.ai/code/session_01LEoff8bXGBS83tK1c55Mf7

Workouts/Views/Exercises/ExerciseAddEditView.swift

@@ -23,7 +23,6 @@ struct ExerciseAddEditView: View {
 
     // Local editable state
     @State private var exerciseName: String
-    @State private var originalWeight: Int
     @State private var loadType: LoadType
     @State private var minutes: Int
     @State private var seconds: Int
@@ -31,9 +30,11 @@ struct ExerciseAddEditView: View {
     @State private var weightOnes: Int
     @State private var reps: Int
     @State private var sets: Int
-    @State private var weightReminderWeeks: Int
-    @State private var weightLastUpdated: Date?
-    @State private var category: ExerciseCategory
+    // Machine comfort settings. `machineEnabled` mirrors the optionality of the
+    // stored `machineSettings` — ON persists a (possibly empty) array, OFF persists
+    // nil. `machineSettings` holds the ordered rows while the toggle is on.
+    @State private var machineEnabled: Bool
+    @State private var machineSettings: [MachineSetting]
     @AppStorage("weightUnit") private var weightUnit: WeightUnit = .lb
 
     init(exercise: Exercise, split: Split) {
@@ -42,7 +43,6 @@ struct ExerciseAddEditView: View {
 
         let w = exercise.weight
         _exerciseName = State(initialValue: exercise.name)
-        _originalWeight = State(initialValue: w)
         _loadType = State(initialValue: exercise.loadTypeEnum)
         _minutes = State(initialValue: exercise.durationMinutes)
         _seconds = State(initialValue: exercise.durationSeconds)
@@ -50,9 +50,8 @@ struct ExerciseAddEditView: View {
         _weightOnes = State(initialValue: w % 10)
         _reps = State(initialValue: exercise.reps)
         _sets = State(initialValue: exercise.sets)
-        _weightReminderWeeks = State(initialValue: exercise.weightReminderTimeIntervalWeeks)
-        _weightLastUpdated = State(initialValue: exercise.weightLastUpdated)
-        _category = State(initialValue: exercise.categoryEnum)
+        _machineEnabled = State(initialValue: exercise.machineSettings != nil)
+        _machineSettings = State(initialValue: exercise.machineSettings ?? [])
     }
 
     var body: some View {
@@ -100,19 +99,6 @@ struct ExerciseAddEditView: View {
                     }
                 }
 
-                Section(
-                    header: Text("Category"),
-                    footer: Text("The split screen groups its exercises by category, with the warm-up listed first.")
-                ) {
-                    Picker("", selection: $category) {
-                        ForEach(ExerciseCategory.displayOrder, id: \.self) { cat in
-                            Text(cat.displayName)
-                                .tag(cat)
-                        }
-                    }
-                    .pickerStyle(.segmented)
-                }
-
                 Section(
                     header: Text("Load Type"),
                     footer: Text("For bodyweight exercises choose None. For resistance or weight training select Weight. For exercises that are time oriented (like plank or meditation) select Time.")
@@ -170,16 +156,17 @@ struct ExerciseAddEditView: View {
                     }
                 }
 
-                Section(header: Text("Weight Increase")) {
-                    HStack {
-                        Text("Remind every \(weightReminderWeeks) weeks")
-                        Spacer()
-                        Stepper("", value: $weightReminderWeeks, in: 0...366)
-                    }
-                    if let lastUpdated = weightLastUpdated {
-                        Text("Last weight change \(Date().humanTimeInterval(to: lastUpdated)) ago")
+                Section(
+                    header: Text("Machine"),
+                    footer: Text("Turn on for machine-based exercises to record comfort settings (seat height, back-rest incline, pin position…). During a workout you can adjust these and update this default.")
+                ) {
+                    Toggle("Machine-based", isOn: $machineEnabled.animation())
+
+                    if machineEnabled {
+                        MachineSettingsEditor(settings: $machineSettings)
                     }
                 }
+
             }
             .sheet(isPresented: $showingExercisePicker) {
                 ExercisePickerView { exerciseNames in
@@ -206,7 +193,6 @@ struct ExerciseAddEditView: View {
 
     private func saveExercise() {
         let newWeight = weightTens + weightOnes
-        let updatedWeightDate: Date? = newWeight != originalWeight ? Date() : weightLastUpdated
         let durationSecs = minutes * 60 + seconds
 
         var doc = SplitDocument(from: split)
@@ -217,9 +203,8 @@ struct ExerciseAddEditView: View {
             doc.exercises[idx].weight = newWeight
             doc.exercises[idx].loadType = loadType.rawValue
             doc.exercises[idx].durationSeconds = durationSecs
-            doc.exercises[idx].weightLastUpdated = updatedWeightDate
-            doc.exercises[idx].weightReminderWeeks = weightReminderWeeks
-            doc.exercises[idx].category = category.rawValue
+            // ON → a (possibly empty) array; OFF → nil, discarding any prior settings.
+            doc.exercises[idx].machineSettings = machineEnabled ? machineSettings : nil
         }
         doc.updatedAt = Date()
         Task { await sync.save(split: doc) }