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/LogWindow.axaml.cs

@@ -0,0 +1,48 @@
+using Nonemm.Core;
+
+namespace Nonemm.App.Windows;
+
+/// The contacts of the contest in progress, newest last.
+public sealed partial class LogWindow : RefreshableWindow
+{
+    private readonly AppSession session;
+
+    public LogWindow(AppSession session)
+    {
+        this.session = session;
+        InitializeComponent();
+        Refresh();
+    }
+
+
+    public override void Refresh()
+    {
+        if (session.Logging is null)
+        {
+            Rows.ItemsSource = Array.Empty<LogRow>();
+            SummaryText.Text = "no contest is open";
+            return;
+        }
+        List<LogRow> rows = session.Logging.Log.Qsos
+            .Select(q => new LogRow(q, VerdictFor(q)))
+            .ToList();
+        Rows.ItemsSource = rows;
+        if (rows.Count > 0)
+        {
+            Rows.ScrollIntoView(rows[^1], null);
+        }
+        SummaryText.Text =
+            $"{session.Logging.Log.Tally.Qsos} contacts · {session.Logging.Log.Tally.Points} points · " +
+            $"{session.Logging.Log.Tally.TotalMultipliers} multipliers · score {session.Logging.Log.TotalScore:N0}";
+    }
+
+    /// A logged contact is coloured by what it turned out to be worth, not by
+    /// judging it again as if it were new.
+    private static Contests.Verdict VerdictFor(Qso qso) =>
+        new(
+            IsDupe: false,
+            Points: qso.Points,
+            NewMultipliers: qso.IsMultiplier1 || qso.IsMultiplier2 || qso.IsMultiplier3
+                ? [new Contests.Multiplier(1, "", "")]
+                : []);
+}