Extract the exercise info view and ready the figure palette and app icon for macOS

Workouts/ExerciseFigure/ExerciseFigureView.swift

@@ -6,6 +6,9 @@
 //
 
 import SwiftUI
+#if canImport(AppKit)
+import AppKit
+#endif
 
 /// The looping animated stick-figure for the run screen's bottom half, rendered with
 /// `Canvas` + `TimelineView(.animation)` from the bundled anatomical rig data (see
@@ -255,6 +258,12 @@ private extension Color {
     static func figure(light: (Double, Double, Double), dark: (Double, Double, Double)) -> Color {
         #if os(watchOS)
         Color(red: dark.0, green: dark.1, blue: dark.2)
+        #elseif os(macOS)
+        Color(nsColor: NSColor(name: nil) { appearance in
+            appearance.bestMatch(from: [.aqua, .darkAqua]) == .darkAqua
+                ? NSColor(red: dark.0, green: dark.1, blue: dark.2, alpha: 1)
+                : NSColor(red: light.0, green: light.1, blue: light.2, alpha: 1)
+        })
         #else
         Color(UIColor { traits in
             traits.userInterfaceStyle == .dark
@@ -301,6 +310,8 @@ private extension Color {
     /// Opaque head fill — the screen background, so limbs pass behind the face.
     #if os(watchOS)
     static let figureHeadFill = Color.black
+    #elseif os(macOS)
+    static let figureHeadFill = Color(nsColor: .windowBackgroundColor)
     #else
     static let figureHeadFill = Color(.systemBackground)
     #endif