Show local spots in bold and name the computer that made them

A spot an operator put on a bandmap, here or on another computer, is
drawn in bold. Its hover text names the computer instead of the
spotter's callsign. A spot from another computer carries the name from
the ADDSPOT message.

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

src/Nonemm.App/Windows/EntryWindow.axaml.cs

@@ -1295,7 +1295,10 @@ public sealed partial class EntryWindow : Window
             Logging.Frequency,
             DateTime.UtcNow,
             Nonemm.Spotting.SpotSource.Operator,
-            Logging.Me.Callsign));
+            Logging.Me.Callsign)
+        {
+            Computer = session.ComputerName,
+        });
         Status($"{Logging.Entry.Call.Trim()} put on the bandmap");
     }
 }