Show only the newest SFI, A and K in the solar weather bar

For sh/wwv, only the first record under the header is used, since the
table lists the newest first. The date, time, forecast and logger are
dropped, and the status bar reads "SFI 140  A 5  K 2". The line the node
sent is the tool tip. Announcement lines give the same three values.

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

src/Nonemm.App/AppSession.cs

@@ -914,7 +914,7 @@ public sealed partial class AppSession : IDisposable
     public void ConnectCluster()
     {
         cluster?.Dispose();
-        SetSolar("");
+        SetSolar(null);
         cluster = new ClusterClient(
             Settings.ClusterHost,
             Settings.ClusterPort,
@@ -924,20 +924,20 @@ public sealed partial class AppSession : IDisposable
             autoLogon: Settings.ClusterAutoLogon,
             keepAliveInterval: TimeSpan.FromMinutes(Math.Max(1, Settings.ClusterKeepAliveMinutes)));
         cluster.SpotArrived += (_, spot) => TakeSpot(spot);
-        cluster.SolarArrived += (_, text) => SetSolar(text);
+        cluster.SolarArrived += (_, report) => SetSolar(report);
         cluster.ConnectionChanged += (_, _) => Changed?.Invoke(this, EventArgs.Empty);
         cluster.Start();
     }
 
-    /// The latest solar weather the cluster sent, or empty when it has sent
+    /// The latest solar weather the cluster sent, or null when it has sent
     /// none on this connection.
-    public string Solar { get; private set; } = "";
+    public SolarReport? Solar { get; private set; }
 
     public event EventHandler? SolarChanged;
 
-    private void SetSolar(string text)
+    private void SetSolar(SolarReport? report)
     {
-        Solar = text;
+        Solar = report;
         SolarChanged?.Invoke(this, EventArgs.Empty);
     }
 
@@ -945,7 +945,7 @@ public sealed partial class AppSession : IDisposable
     {
         cluster?.Dispose();
         cluster = null;
-        SetSolar("");
+        SetSolar(null);
         Changed?.Invoke(this, EventArgs.Empty);
     }