Add fax admin panel (#15215)

Content.Client/Fax/AdminUI/AdminFaxEui.cs

@@ -0,0 +1,37 @@
+using Content.Client.Eui;
+using Content.Shared.Eui;
+using Content.Shared.Fax;
+using JetBrains.Annotations;
+
+namespace Content.Client.Fax.AdminUI;
+
+[UsedImplicitly]
+public sealed class AdminFaxEui : BaseEui
+{
+    private readonly AdminFaxWindow _window;
+
+    public AdminFaxEui()
+    {
+        _window = new AdminFaxWindow();
+        _window.OnClose += () => SendMessage(new AdminFaxEuiMsg.Close());
+        _window.OnFollowFax += uid => SendMessage(new AdminFaxEuiMsg.Follow(uid));
+        _window.OnMessageSend += args => SendMessage(new AdminFaxEuiMsg.Send(args.uid, args.title, args.from, args.message, args.stamp));
+    }
+
+    public override void Opened()
+    {
+        _window.OpenCentered();
+    }
+
+    public override void Closed()
+    {
+        _window.Close();
+    }
+
+    public override void HandleState(EuiStateBase state)
+    {
+        if (state is not AdminFaxEuiState cast)
+            return;
+        _window.PopulateFaxes(cast.Entries);
+    }
+}