Various Improvements to NanoChat (#2922)

* Port improvements to NanoChat from Einstein-Engines and Goob-Station

* fix duplicate translation key

* add missing space

* Properly mark DeltaV changes

* Allow muting individual NanoChat users, NanoChat UI to put per-chat buttons next to the message box

* remove leftover from testing stuff

* cycle through inputs with tab, confirm with enter; for new and edit chat

* Add channel switching with (Shift+)Alt+Up/Down; Discord-Style

* better null check

* another better null check

* Implement changes from ImpStation PR

* Rename ContactControl -> ContactContainer

* Requested changes

* Move Loc to _DV, don't register system as manager

* I'm so smart :)

---------

Co-authored-by: Alex C <alex91905@yahoo.com>

Content.Shared/_DV/NanoChat/SharedNanoChatSystem.cs

@@ -31,6 +31,16 @@ public abstract class SharedNanoChatSystem : EntitySystem
         args.PushMarkup(Loc.GetString("nanochat-card-examine-number", ("number", $"{ent.Comp.Number:D4}")));
     }
 
+    /// <summary>
+    ///     Helper Method for truncating a string to maximum length
+    /// </summary>
+    public static string Truncate(string text, int maxLength, string overflowText = "...")
+    {
+        return text.Length > maxLength
+            ? text[..(maxLength - overflowText.Length)] + overflowText
+            : text;
+    }
+
     #region Public API Methods
 
     /// <summary>
@@ -188,6 +198,19 @@ public abstract class SharedNanoChatSystem : EntitySystem
         Dirty(card);
     }
 
+    /// <summary>
+    ///     Sets whether notifications are muted for a specific chat.
+    /// </summary>
+    public void ToggleChatMuted(Entity<NanoChatCardComponent?> card, uint chat)
+    {
+        if (!Resolve(card, ref card.Comp))
+            return;
+
+        if (!card.Comp.MutedChats.Remove(chat))
+            card.Comp.MutedChats.Add(chat);
+        Dirty(card);
+    }
+
     /// <summary>
     ///     Gets whether NanoChat number is listed.
     /// </summary>