fix: regenerate cut-offs on part rotation and default cut direction

- Regenerate cut-off programs after RotateSelectedParts so cut lines
  update when parts are rotated, not just moved
- Change default CutDirection from TowardOrigin to AwayFromOrigin so
  cuts start at the origin axis

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

OpenNest.Core/CutOffSettings.cs

@@ -11,6 +11,6 @@ namespace OpenNest
         public double PartClearance { get; set; } = 0.125;
         public double Overtravel { get; set; }
         public double MinSegmentLength { get; set; } = 0.05;
-        public CutDirection CutDirection { get; set; } = CutDirection.TowardOrigin;
+        public CutDirection CutDirection { get; set; } = CutDirection.AwayFromOrigin;
     }
 }

OpenNest/Controls/PlateView.cs

@@ -1236,6 +1236,9 @@ namespace OpenNest.Controls
 
             for (var i = 0; i < SelectedParts.Count; ++i)
                 SelectedParts[i].Offset(diff);
+
+            if (Plate.CutOffs.Count > 0)
+                Plate.RegenerateCutOffs(cutOffSettings);
         }
 
         protected override void UpdateMatrix()