fix(ui): draw cut-off ids on a disc of the cut-off line's color

The plate-colored disc behind a cut-off id read as a notch in any part edge
the cut runs along. An orange-red disc with a white id reads as a tag on the
cut-off line instead, and still keeps the dashed line from striking it through.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

OpenNest.WinForms.Tests/Controls/LayoutPartLabelZoomTests.cs

@@ -54,7 +54,7 @@ public class LayoutPartLabelZoomTests
         using var image = new Bitmap(120, 120);
         using var g = Graphics.FromImage(image);
         g.Clear(Color.White);
-        layout.DrawLabel(g, "12", muted: false, Brushes.Yellow);
+        layout.DrawLabel(g, "12", Brushes.Yellow, Brushes.Black);
 
         Assert.Equal(shown, !IsBlank(image));
         layout.ReleaseDisplayResources();

OpenNest/Controls/PlateRenderer.cs

@@ -281,9 +281,11 @@ namespace OpenNest.Controls
         {
             DrawCutOffLines(g);
 
-            // Over the lines, on a disc of the plate's color, so the cut does not strike them through.
+            // Over the lines, on a disc of the line's color so the cut does not strike them through.
+            // A disc of the plate's color read as a notch in any part edge the cut runs along.
+            using var disc = new SolidBrush(CutOffLineColor);
             foreach (var (part, id, muted) in cutOffLabels)
-                part.DrawLabel(g, id, muted, view.ColorScheme.LayoutFillBrush);
+                part.DrawLabel(g, id, muted ? Brushes.Gray : disc, Brushes.White);
             cutOffLabels.Clear();
         }
 

OpenNest/LayoutPart.cs

@@ -173,7 +173,7 @@ namespace OpenNest
         /// Draws the id over a disc of <paramref name="background"/>, so a line drawn through the
         /// label's point, such as a cut-off's own cut, does not strike through the number.
         /// </summary>
-        internal void DrawLabel(Graphics g, string id, bool muted, Brush background)
+        internal void DrawLabel(Graphics g, string id, Brush background, Brush text)
         {
             var size = MeasureLabel(g, id);
             if (!LabelFits(size))
@@ -181,7 +181,7 @@ namespace OpenNest
             var diameter = LabelDiscDiameter(size);
             g.FillEllipse(background,
                 _labelScreenPoint.X - diameter / 2, _labelScreenPoint.Y - diameter / 2, diameter, diameter);
-            DrawLabel(g, id, muted);
+            g.DrawString(id, ProgramIdFont, text, _labelScreenPoint.X, _labelScreenPoint.Y, LabelFormat);
         }
 
         private SizeF MeasureLabel(Graphics g, string id)