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/Configuration/Settings.cs

@@ -1,6 +1,7 @@
 using System.Reflection;
 using System.Text.Json;
 using Nonemm.Core;
+using Nonemm.Network;
 using Nonemm.Session;
 
 namespace Nonemm.App.Configuration;
@@ -118,6 +119,29 @@ public sealed record Settings
 
     public IReadOnlyList<string> NetworkPeers { get; init; } = [];
 
+    /// The link to the other logging computers of a multi-operator entry, on
+    /// N1MM's port 12070. It is not the same thing as `NetworkEnabled`, which
+    /// is the XML broadcast on 12060 that other programs read; a station can
+    /// want either, or both.
+    public bool StationLinkEnabled { get; init; }
+
+    public int StationLinkPort { get; init; } = StationBeacon.DefaultPort;
+
+    /// Which station of the entry this computer is. It goes into every message
+    /// and lets a contact say which position made it.
+    public int StationNumber { get; init; } = 1;
+
+    /// The version this program claims to be on the network. N1MM refuses a
+    /// station whose version is not its own, so to work beside N1MM this has to
+    /// be the version those copies are running. The default is the version of
+    /// the N1MM this program was written against.
+    public string StationLinkVersion { get; init; } = "1.0.11364";
+
+    /// Stations named by hand, for a network where a broadcast does not reach
+    /// every computer. Each is a name and an address — `RUN-PC@192.168.1.5`,
+    /// with `:port` on the end when that station is not on the usual port.
+    public IReadOnlyList<string> StationLinkPeers { get; init; } = [];
+
     /// The call history file for this contest, or empty for none. They are
     /// published per contest, so this is not a fixed name.
     public string CallHistoryFile { get; init; } = "";