retain order of the exercises during persistence process

WorkoutsPlus/Exercise/Exercise.swift

@@ -9,13 +9,18 @@ import Foundation
 import SwiftData
 
 @Model
-class Exercise {
+final class Exercise: Identifiable {
+		var id = UUID()
 		var name: String
 		
+		var workout: Workout?
+		var position: Int = 0
+		
 		var exerciseTemplate: ExerciseTemplate? {
 				didSet {
 						self.name = exerciseTemplate?.name ?? "self.name"
-				}}
+				}
+		}
 		var reps: Int = 0
 		
 		init(_ reps: Int, _ exercise: String) {
@@ -29,7 +34,9 @@ class Exercise {
 				self.name = exerciseTemplate.name
 				self.exerciseTemplate = exerciseTemplate
 		}
-		
+}
+
+extension Exercise {
 		static let sampleData: [Exercise] = {
 				var exercises = [Exercise]()
 				

WorkoutsPlus/Exercise/ExerciseLibrary.swift

@@ -49,15 +49,7 @@ struct ExerciseLibrary: View {
 												.textInputAutocapitalization(.words)
 												.focused($isInputFieldFocused)
 										}
-										Button(action: {
-												addExerciseTemplate()
-										}) {
-												HStack {
-														Image(systemName: "plus.circle.fill")
-																.foregroundStyle(.green)
-														Text("Add Exercise")
-												}
-										}
+										AddItemButton(label: "Exercise", action: addExerciseTemplate)
 								}
 								.searchable(text: $searchText)
 						}