Resolve the seed redirect when editing a schedule's routine

A schedule made against a starter-seed routine keeps the retired seed id
after the routine is edited (clone-on-edit). The edit form matched that id
directly, so the routine read as unselected and Save stayed disabled; it
now resolves through sync.currentRoutineID like the Today board does, and
the routine picker's checkmark compares against the resolved id.

Workouts/Views/Today/ScheduleAddEditView.swift

@@ -117,8 +117,14 @@ struct ScheduleAddEditView: View {
 
     private var isEditing: Bool { scheduleID != nil }
 
-    /// The live routine currently selected; nil when the stored id no longer resolves.
-    private var selectedRoutine: Routine? { routines.first { $0.id == routineID } }
+    /// The live routine currently selected, following the seed clone-on-edit redirect
+    /// (a schedule made against a starter seed keeps the retired seed id after the
+    /// routine is edited); nil when the routine has been deleted.
+    private var selectedRoutine: Routine? {
+        guard !routineID.isEmpty else { return nil }
+        let liveID = sync.currentRoutineID(for: routineID)
+        return routines.first { $0.id == liveID }
+    }
 
     /// The When choices this presentation offers — "Now" only when adding on today.
     /// Built as a list (rather than conditionally hiding a tag inside the Picker)
@@ -171,7 +177,8 @@ struct ScheduleAddEditView: View {
     private var routineSection: some View {
         Section {
             NavigationLink {
-                RoutinePickerList(routines: routines, selectedID: $routineID)
+                RoutinePickerList(routines: routines, currentID: selectedRoutine?.id,
+                                  selectedID: $routineID)
             } label: {
                 HStack {
                     Text("Routine")
@@ -333,6 +340,9 @@ struct ScheduleAddEditView: View {
 /// Tapping selects and pops back.
 private struct RoutinePickerList: View {
     let routines: [Routine]
+    /// The resolved live id of the current selection (for the checkmark) — may differ
+    /// from the binding's stored value when a seed clone-on-edit redirect is in play.
+    let currentID: String?
     @Binding var selectedID: String
     @Environment(\.dismiss) private var dismiss
 
@@ -350,7 +360,7 @@ private struct RoutinePickerList: View {
                     Text(routine.name)
                         .foregroundStyle(.primary)
                     Spacer()
-                    if routine.id == selectedID {
+                    if routine.id == currentID {
                         Image(systemName: "checkmark")
                             .fontWeight(.semibold)
                             .foregroundStyle(Color.accentColor)