fix(ui): reverse sequence order so cutting starts near origin

The sequencer returns parts ordered from exit point inward. Reverse
so part 1 is nearest the origin and cutting works outward.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

OpenNest/Forms/EditNestForm.cs

@@ -461,8 +461,8 @@ namespace OpenNest.Forms
             var ordered = sequencer.Sequence(plate.Parts.ToList(), plate);
 
             plate.Parts.Clear();
-            foreach (var s in ordered)
+            for (var i = ordered.Count - 1; i >= 0; i--)
-                plate.Parts.Add(s.Part);
+                plate.Parts.Add(ordered[i].Part);
         }
 
         public void CalculateCurrentPlateCutTime()