Put the contacts of the last 20 minutes on the bandmap as local spots

A contest opening and contacts arriving from the other stations, a
resync included, spot the contacts logged in the last few minutes (a
setting on the telnet Filters tab, 0 for none). A station the bandmap
already holds on that band keeps its spot. Nothing is sent out. Spots
that come from the log are drawn in italics.

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

src/Nonemm.App/Windows/BandmapView.cs

@@ -50,6 +50,7 @@ public sealed class BandmapView : Control
 
     private readonly Typeface typeface = new(Fonts.Mono);
     private readonly Typeface boldTypeface = new(Fonts.Mono, FontStyle.Normal, FontWeight.Bold);
+    private readonly Typeface italicTypeface = new(Fonts.Mono, FontStyle.Italic);
     private IReadOnlyList<BandmapLabel> placed = [];
     private BandmapScale scale = new(Bands.Band20M.Low, Bands.Band20M.High, 1);
 
@@ -181,7 +182,12 @@ public sealed class BandmapView : Control
             new Point(ScaleX + 2, label.MarkY),
             new Point(LabelX - 2, label.LabelY + (LabelHeight / 2)));
         context.DrawText(
-            Text(label.Spot.Call.Text, colour, TextSize, label.Spot.IsLocal || label.Spot.IsCqFrequency),
+            Text(
+                label.Spot.Call.Text,
+                colour,
+                TextSize,
+                label.Spot.IsLocal || label.Spot.IsCqFrequency,
+                label.Spot.Source == SpotSource.Log),
             new Point(LabelX, label.LabelY + (LabelPadding / 2)));
     }
 
@@ -221,8 +227,14 @@ public sealed class BandmapView : Control
         FrequencyPicked?.Invoke(this, scale.At(at.Y - Inset));
     }
 
-    private FormattedText Text(string text, IBrush brush, double size, bool bold = false) =>
-        new(text, CultureInfo.InvariantCulture, FlowDirection.LeftToRight, bold ? boldTypeface : typeface, size, brush);
+    private FormattedText Text(string text, IBrush brush, double size, bool bold = false, bool italic = false) =>
+        new(
+            text,
+            CultureInfo.InvariantCulture,
+            FlowDirection.LeftToRight,
+            bold ? boldTypeface : italic ? italicTypeface : typeface,
+            size,
+            brush);
 
     /// The form's text colour, which the theme sets in both light and dark.
     private IBrush Foreground() =>