Let routines rename exercises and repeat them for interval segments

An exercise's name is now a per-routine display name: a new optional
libraryName on ExerciseDocument (snapshotted onto WorkoutLogDocument at
plan time) keeps the link to the bundled library exercise, and every
figure/info/cue lookup resolves libraryName ?? name. Deliberately not
schema-bumped — an older app dropping the key only strands the
figure link, same rationale as activityType. Cache schema bumped to 9
for the new columns.

The picker no longer filters out exercises already in the routine
(an "×N" badge marks them instead), exercise rows gain a leading
Duplicate swipe that clones an entry in place, and the edit sheet gets
a Name field with the library exercise shown read-only above it.

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

Workouts/Views/Exercises/ExercisePickerView.swift

@@ -15,10 +15,17 @@ struct ExercisePickerView: View {
 
     var onExerciseSelected: ([String]) -> Void
     var allowMultiSelect: Bool = false
+    /// How many times each exercise already appears in the routine being edited —
+    /// shown as a "×N" badge so picking it again (for interval-style segments like
+    /// a treadmill's warmup/brisk/cooldown) doesn't read as a mistake. Keyed by
+    /// library name. Empty for callers with no notion of "already in this routine".
+    var inRoutineCounts: [String: Int] = [:]
 
-    init(onExerciseSelected: @escaping ([String]) -> Void, allowMultiSelect: Bool = false) {
+    init(onExerciseSelected: @escaping ([String]) -> Void, allowMultiSelect: Bool = false,
+         inRoutineCounts: [String: Int] = [:]) {
         self.onExerciseSelected = onExerciseSelected
         self.allowMultiSelect = allowMultiSelect
+        self.inRoutineCounts = inRoutineCounts
     }
 
     var body: some View {
@@ -35,6 +42,10 @@ struct ExercisePickerView: View {
                         HStack {
                             Text(exerciseName)
                             Spacer()
+                            if let count = inRoutineCounts[exerciseName], count > 0 {
+                                Text("×\(count)")
+                                    .foregroundStyle(.secondary)
+                            }
                             if selectedExercises.contains(exerciseName) {
                                 Image(systemName: "checkmark")
                                     .foregroundColor(.accentColor)
@@ -46,7 +57,14 @@ struct ExercisePickerView: View {
                         onExerciseSelected([exerciseName])
                         dismiss()
                     }) {
-                        Text(exerciseName)
+                        HStack {
+                            Text(exerciseName)
+                            Spacer()
+                            if let count = inRoutineCounts[exerciseName], count > 0 {
+                                Text("×\(count)")
+                                    .foregroundStyle(.secondary)
+                            }
+                        }
                     }
                 }
             }