Show the other computers, and apply the ten-minute rule

Three pieces on top of the link:

**The network status window**, on the entry window's Window menu. A row
per station, this computer included the way N1MM shows it: number,
address, operator, band, mode, run, transmit, pass frequency, the last
message type, how long ago it arrived, the counts each way and the echo
round trip. A station that broadcast the wrong version is named under the
table in red — that is the one fault where everything looks connected
and nothing arrives. The box at the bottom sends a line of chat, and
Echo asks every station whether it is there.

**Where this station is** goes out once a second when it has changed.
The frequency, the mode and run have a dozen places they can change from
— the radio moving, a band button, a QSY typed into the callsign box —
so it is read and compared rather than announced from each of them.

**The ten-minute rule.** `BandChangeRules` already counted changes and
the stay on a band, and the entry window already showed the countdown,
but only a user-defined contest carried a rule, so every built-in
contest allowed anything. `ForCategory` gives a multi-operator entry
with one or two transmitters a ten-minute stay, which is N1MM's fallback
in `ContestInstance.BandChangeTimerDuration` for every contest that does
not name its own. Its per-contest table is a few hundred cases in a
decompiled hash switch and is not repeated.

Config ▸ Edit Networked-Computer Names now covers both networks: the
12060 broadcast to other programs and the 12070 link, with the station
number, the port, the version to claim and stations named by address for
a network where a broadcast does not reach.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PdAYHcdRktqKry7nk414TU

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

@@ -431,6 +431,9 @@ public sealed partial class EntryWindow
 
     private void OnShowScore(object? sender, RoutedEventArgs e) => Show(() => new ScoreWindow(session));
 
+    private void OnShowNetworkStatus(object? sender, RoutedEventArgs e) =>
+        Show(() => new NetworkStatusWindow(session));
+
     /// N1MM's grey line window: where the daylight is now, and where it will be.
     private void OnShowGrayline(object? sender, RoutedEventArgs e) =>
         Show(() => new GraylineWindow(session));
@@ -518,10 +521,21 @@ public sealed partial class EntryWindow
         {
             session.Save(updated);
             session.ApplyNetworkSettings();
-            Status(updated.NetworkEnabled ? "networked with the other stations" : "networking off");
+            session.ApplyStationLinkSettings();
+            Status(Networking(updated));
         }
     }
 
+    /// What the two networks are now doing, for the status line.
+    private static string Networking(Settings settings) =>
+        (settings.NetworkEnabled, settings.StationLinkEnabled) switch
+        {
+            (true, true) => "broadcasting contacts and linked to the other computers",
+            (true, false) => "broadcasting contacts to other programs",
+            (false, true) => "linked to the other logging computers",
+            _ => "networking off",
+        };
+
     private async void OnKeyerSettings(object? sender, RoutedEventArgs e)
     {
         KeyerDialog dialog = new(session.Settings);