add ActiveWorkoutSession logic, refactor Home, add additional sample data, add isDebug

WorkoutsPlus/Workout/WorkoutDetail.swift

@@ -45,7 +45,7 @@ struct WorkoutDetail: View {
 								AddItemButton(label: "Exercise", action: presentWorkoutItemLibrarySheet)
 						}
 				}
-				.navigationBarTitle("\(workout.name)")
+				.navigationTitle("\(workout.name)")
 				.toolbar {
 						// TODO: Add proper Sharing for workouts.
 						ToolbarItem() { ShareLink(item: URL(filePath: "felixfoertsch.de")!) }
@@ -88,14 +88,14 @@ struct WorkoutDetail: View {
 
 #Preview {
 		NavigationStack {
-				WorkoutDetail(workout: Workout.sampleData)
+				WorkoutDetail(workout: Workout.sampleData.first!)
 						.modelContainer(SampleData.shared.modelContainer)
 		}
 }
 
 #Preview("Debug") {
 		TabView {
-				WorkoutDetail(workout: Workout.sampleData)
+				WorkoutDetail(workout: Workout.sampleData.first!)
 						.tabItem {
 								Image(systemName: "figure.run.square.stack")
 								Text("Workouts")