actually rotate the image in output

Photo.cs

@@ -219,6 +219,9 @@ public class Photo {
       Console.WriteLine($"{Filename} => {jpgOut}");
       await image.SaveAsync(jpgOut, new JpegEncoder() { Quality = 100 });
 
+      if (Math.Abs(RotationDegrees) > 0.001) {
+        image.Mutate(x => x.Rotate(RotationDegrees));
+      }
       if (CropRectangle != Rectangle.Empty) {
         image.Mutate(x => x.Crop(CropRectangle));
       }

Program.cs

@@ -265,6 +265,10 @@ public class StraightenTool : ITool {
   }
 
   public ToolStatus HandleInput(KeyboardState input, MouseState mouse, Transform transform, Game game, Photo photo, UiGeometry geometry) {
+    if (input.IsKeyPressed(Keys.D0)) {
+      photo.RotationDegrees = 0;
+    }
+
     if (input.IsKeyPressed(Keys.Left)) {
       photo.RotationDegrees += .1f;
     }
@@ -700,6 +704,7 @@ public class Game : GameWindow {
     }
 
     // Handle tool switching.
+    // FIXME: prevent photo switching when tools other than ViewTool are active?
     if (photos[photoIndex] != previousPhoto) {
       activeTool = viewTool;
     }
@@ -708,7 +713,7 @@ public class Game : GameWindow {
       if (input.IsKeyPressed(Keys.C)) {
         activeTool = new CropTool(photos[photoIndex]);
       }
-      if (input.IsKeyPressed(Keys.S)) {
+      if (input.IsKeyPressed(Keys.X)) {
         activeTool = new StraightenTool(photos[photoIndex]);
       }
     }
@@ -789,10 +794,10 @@ public class Game : GameWindow {
     // Load photos from a directory.
     // string[] files = Directory.GetFiles(@"c:\users\colin\desktop\photos-test\");
     // string[] files = Directory.GetFiles(@"c:\users\colin\pictures\photos\2023\07\14\");
-    string[] files = Directory.GetFiles(@"c:\users\colin\pictures\photos\2023\09\06\jpg");
+    // string[] files = Directory.GetFiles(@"c:\users\colin\pictures\photos\2023\09\06\jpg");
     // string[] files = Directory.GetFiles(@"G:\DCIM\100EOSR6\");
     // string[] files = Directory.GetFiles(@"c:\users\colin\desktop\totte-output\2023\08\03");
-    // string[] files = Directory.GetFiles(@"c:\users\colin\desktop\export");
+    string[] files = Directory.GetFiles(@"c:\users\colin\desktop\export");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Pictures\photos\2018\06\23");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\Germany all\104D7000");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\many-birds\");