Add the Avalonia application and the station network

The entry window types contacts and colours them as they are typed; the log,
check, bandmap, score and packet windows read the same session. Contacts are
shared with the other stations of a multi-operator entry in N1MM's contact
message, so an N1MM station on the same network sees them too.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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

@@ -0,0 +1,87 @@
+using Avalonia.Controls;
+using Nonemm.Core;
+
+namespace Nonemm.App.Windows;
+
+/// Contacts, points and multipliers band by band.
+public sealed partial class ScoreWindow : RefreshableWindow
+{
+    private readonly AppSession session;
+
+    public ScoreWindow(AppSession session)
+    {
+        this.session = session;
+        InitializeComponent();
+        Refresh();
+    }
+
+
+    public override void Refresh()
+    {
+        Table.Children.Clear();
+        Table.ColumnDefinitions.Clear();
+        Table.RowDefinitions.Clear();
+        if (session.Logging is null)
+        {
+            TotalText.Text = "no contest is open";
+            return;
+        }
+
+        List<Band> bands = session.Logging.Log.Qsos
+            .Select(q => q.Band)
+            .OfType<Band>()
+            .Distinct()
+            .OrderBy(b => b.MegahertzLabel)
+            .ToList();
+
+        foreach (string _ in new[] { "band", "qsos", "points", "mults" })
+        {
+            Table.ColumnDefinitions.Add(new ColumnDefinition(GridLength.Star));
+        }
+        AddRow(0, "Band", "QSOs", "Points", "Mults", header: true);
+
+        int row = 1;
+        foreach (Band band in bands)
+        {
+            IReadOnlyList<Qso> onBand = session.Logging.Log.Qsos.Where(q => q.Band == band).ToList();
+            AddRow(
+                row++,
+                band.Name,
+                onBand.Count.ToString(),
+                onBand.Sum(q => q.Points).ToString(),
+                onBand.Sum(MultiplierCount).ToString());
+        }
+        AddRow(
+            row,
+            "Total",
+            session.Logging.Log.Tally.Qsos.ToString(),
+            session.Logging.Log.Tally.Points.ToString(),
+            session.Logging.Log.Tally.TotalMultipliers.ToString(),
+            header: true);
+
+        TotalText.Text = $"Claimed score {session.Logging.Log.TotalScore:N0}";
+    }
+
+    private static int MultiplierCount(Qso qso) =>
+        (qso.IsMultiplier1 ? 1 : 0) + (qso.IsMultiplier2 ? 1 : 0) + (qso.IsMultiplier3 ? 1 : 0);
+
+    private void AddRow(int row, string band, string qsos, string points, string mults, bool header = false)
+    {
+        Table.RowDefinitions.Add(new RowDefinition(GridLength.Auto));
+        string[] cells = [band, qsos, points, mults];
+        for (int column = 0; column < cells.Length; column++)
+        {
+            TextBlock text = new()
+            {
+                Text = cells[column],
+                FontFamily = new Avalonia.Media.FontFamily("monospace"),
+                FontSize = 13,
+                Opacity = header ? 1.0 : 0.85,
+                Margin = new Avalonia.Thickness(0, 2, 8, 2),
+            };
+            Grid.SetRow(text, row);
+            Grid.SetColumn(text, column);
+            Table.Children.Add(text);
+        }
+    }
+}