Add ahelp typing indicator for admins (#19060)

* Add ahelp typing indicator for admins

* Lower typing updates throttle from 3 seconds to 1

* Add stopping typing when sending a message

* Lower typing indicator timeout from 15 to 10 seconds

Content.Client/Administration/Systems/BwoinkSystem.cs

@@ -2,13 +2,17 @@
 using Content.Shared.Administration;
 using JetBrains.Annotations;
 using Robust.Shared.Network;
+using Robust.Shared.Timing;
 
 namespace Content.Client.Administration.Systems
 {
     [UsedImplicitly]
     public sealed class BwoinkSystem : SharedBwoinkSystem
     {
+        [Dependency] private readonly IGameTiming _timing = default!;
+
         public event EventHandler<BwoinkTextMessage>? OnBwoinkTextMessageRecieved;
+        private (TimeSpan Timestamp, bool Typing) _lastTypingUpdateSent;
 
         protected override void OnBwoinkTextMessage(BwoinkTextMessage message, EntitySessionEventArgs eventArgs)
         {
@@ -20,6 +24,19 @@ namespace Content.Client.Administration.Systems
             // Reuse the channel ID as the 'true sender'.
             // Server will ignore this and if someone makes it not ignore this (which is bad, allows impersonation!!!), that will help.
             RaiseNetworkEvent(new BwoinkTextMessage(channelId, channelId, text));
+            SendInputTextUpdated(channelId, false);
+        }
+
+        public void SendInputTextUpdated(NetUserId channel, bool typing)
+        {
+            if (_lastTypingUpdateSent.Typing == typing &&
+                _lastTypingUpdateSent.Timestamp + TimeSpan.FromSeconds(1) > _timing.RealTime)
+            {
+                return;
+            }
+
+            _lastTypingUpdateSent = (_timing.RealTime, typing);
+            RaiseNetworkEvent(new BwoinkClientTypingUpdated(channel, typing));
         }
     }
 }