Write LOCATION to Cabrillo, and give CQ WW M/2 eight band changes an hour

CQ WW lists LOCATION as required, and the export never wrote it. It now
carries the ARRL section, state or province, or DX.

CQ WW M/2 has no stay on a band: it may make eight band changes in a clock
hour. It was getting the ten-minute stay that M/S has.

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

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

@@ -122,6 +122,7 @@ public sealed partial class EntryWindow
             TransmitterCategory = Logging.Instance.TransmitterCategory,
             OverlayCategory = Logging.Instance.OverlayCategory,
             TimeCategory = Logging.Instance.TimeCategory,
+            Location = CabrilloLocation(Logging.Me),
             ClaimedScore = Logging.Log.TotalScore,
             Club = Logging.Me.Club,
             Name = Logging.Me.Name,
@@ -132,6 +133,20 @@ public sealed partial class EntryWindow
         Status($"{Logging.Log.Qsos.Count} contacts written to {Path.GetFileName(path)}");
     }
 
+    /// The section, state or province for a station in the US or Canada, and
+    /// `DX` for any other station.
+    private static string CabrilloLocation(StationInfo me)
+    {
+        foreach (string place in new[] { me.ArrlSection, me.State, me.Province })
+        {
+            if (place.Trim().Length > 0)
+            {
+                return place.Trim().ToUpperInvariant();
+            }
+        }
+        return "DX";
+    }
+
     /// The contacts alone, which is the file to hand to another program. ADIF
     /// has no QTC record, and N1MM leaves the traffic out for that reason.
     private void OnExportAdif(object? sender, RoutedEventArgs e) =>