Add a starter routine gallery with per-seed restore

The Library tab's routines pane gains a "Browse Starter Routines" entry
opening a gallery of every bundled seed — kept or deleted — each showing
Added / name-taken / restorable state, a read-only plan preview, and a
one-tap Add that lifts the seed's delete veto. A "Re-add All Missing
Starters" fallback replaces the all-or-nothing Settings button, which is
removed. The delete confirmation now also warns how many scheduled days
would be left behind on the Today board.

Claude-Session: https://claude.ai/code/session_01H8VxUX4ckjU3vRF5M4L5FV

Workouts/Views/Routines/RoutinesLibraryView.swift

@@ -25,6 +25,8 @@ struct RoutinesLibraryView: View {
     @Query(sort: \Workout.start, order: .reverse)
     private var workouts: [Workout]
 
+    @Query private var schedules: [Schedule]
+
     @State private var showingAddSheet = false
     @State private var routineToEdit: Routine?
     @State private var routineToDelete: Routine?
@@ -50,35 +52,48 @@ struct RoutinesLibraryView: View {
     var body: some View {
         let lastTrained = lastTrainedByRoutineID
         List {
-            ForEach(routines) { routine in
+            // A separate Section so the browse-starters row never joins the
+            // reorderable ForEach below (EditButton's drag/delete affordances only
+            // ever apply to actual routines).
+            Section {
+                ForEach(routines) { routine in
+                    NavigationLink {
+                        RoutineDetailView(routine: routine)
+                    } label: {
+                        RoutineRow(routine: routine, lastTrained: lastTrained[routine.id])
+                    }
+                    .swipeActions(edge: .leading) {
+                        Button {
+                            Task { await sync.duplicate(routine: routine) }
+                        } label: {
+                            Label("Duplicate", systemImage: "plus.square.on.square")
+                        }
+                        .tint(.teal)
+                    }
+                    .swipeActions {
+                        Button(role: .destructive) {
+                            routineToDelete = routine
+                        } label: {
+                            Label("Delete", systemImage: "trash")
+                        }
+                        Button {
+                            routineToEdit = routine
+                        } label: {
+                            Label("Edit", systemImage: "pencil")
+                        }
+                        .tint(.indigo)
+                    }
+                }
+                .onMove(perform: moveRoutines)
+            }
+
+            Section {
                 NavigationLink {
-                    RoutineDetailView(routine: routine)
+                    StarterGalleryView()
                 } label: {
-                    RoutineRow(routine: routine, lastTrained: lastTrained[routine.id])
-                }
-                .swipeActions(edge: .leading) {
-                    Button {
-                        Task { await sync.duplicate(routine: routine) }
-                    } label: {
-                        Label("Duplicate", systemImage: "plus.square.on.square")
-                    }
-                    .tint(.teal)
-                }
-                .swipeActions {
-                    Button(role: .destructive) {
-                        routineToDelete = routine
-                    } label: {
-                        Label("Delete", systemImage: "trash")
-                    }
-                    Button {
-                        routineToEdit = routine
-                    } label: {
-                        Label("Edit", systemImage: "pencil")
-                    }
-                    .tint(.indigo)
+                    Label("Browse Starter Routines", systemImage: "sparkles")
                 }
             }
-            .onMove(perform: moveRoutines)
         }
         .listStyle(.insetGrouped)
         .overlay {
@@ -127,10 +142,21 @@ struct RoutinesLibraryView: View {
                 routineToDelete = nil
             }
         } message: { routine in
-            Text("This will permanently delete \"\(routine.name)\" and all its exercises. Past workouts are kept.")
+            Text(deleteMessage(for: routine))
         }
     }
 
+    /// The delete-confirmation body, extended with a note about any schedules that
+    /// reference this routine — deleting the routine leaves them behind (schedules
+    /// aren't cascaded), so the Today board would otherwise show an orphaned day with
+    /// no explanation.
+    private func deleteMessage(for routine: Routine) -> String {
+        let base = "This will permanently delete \"\(routine.name)\" and all its exercises. Past workouts are kept."
+        let count = schedules.filter { sync.currentRoutineID(for: $0.routineID) == routine.id }.count
+        guard count > 0 else { return base }
+        return base + " Its \(count) scheduled day\(count == 1 ? "" : "s") will stay on the Today board without a startable routine."
+    }
+
     /// Reorder and renumber via `RoutineOrdering`, writing only the routines whose
     /// order actually changed. Order-only writes deliberately leave `updatedAt`
     /// alone — it's bookkeeping, not content, and touching it needlessly risks forking