Fix the stale disconnected (Zzz) icon persisting when a client reconnects (#1631)

Fix the stale disconnected (Zzz) icon persisting when a client
reconnects

## Description:

Refer to issue #1630 

This change modifies the GameServer.addClient function to send the
mark_disconnected = false intent when a client that was previously
disconnected gets replaced by a newly joined client with the same
clientID. Under the old logic, this mark_disconnected = false intent is
not sent if the client was disconnected for longer than 60 seconds
before reconnecting.



https://github.com/user-attachments/assets/5e0ce1c3-9519-4f39-aa80-e46f1275649c

Left side browser (player with red tiles) is the disconnected client
that was disconnected at 00:14 game clock time. It reconnected around
03:56 game clock time.
Right side browser (player with green tiles) is the other client. Use
the game clock time from the right side for the live game clock time.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I have read and accepted the CLA agreement (only required once).

## Please put your Discord username so you can be contacted if a bug or
regression is found:

slyty

---------

Co-authored-by: Drills Kibo <59177241+drillskibo@users.noreply.github.com>

src/server/Client.ts

@@ -5,7 +5,6 @@ import { ClientID } from "../core/Schemas";
 
 export class Client {
   public lastPing: number = Date.now();
-  public isDisconnected: boolean = false;
 
   public hashes: Map<Tick, number> = new Map();
 

src/server/GameServer.ts

@@ -43,6 +43,7 @@ export class GameServer {
   public activeClients: Client[] = [];
   // Used for record record keeping
   private allClients: Map<ClientID, Client> = new Map();
+  private clientsDisconnectedStatus: Map<ClientID, boolean> = new Map();
   private _hasStarted = false;
   private _startTime: number | null = null;
 
@@ -174,7 +175,6 @@ export class GameServer {
         return;
       }
 
-      client.isDisconnected = existing.isDisconnected;
       client.lastPing = existing.lastPing;
 
       this.activeClients = this.activeClients.filter((c) => c !== existing);
@@ -184,6 +184,8 @@ export class GameServer {
     this.activeClients.push(client);
     client.lastPing = Date.now();
 
+    this.markClientDisconnected(client.clientID, false);
+
     this.allClients.set(client.clientID, client);
 
     client.ws.removeAllListeners("message");
@@ -571,25 +573,27 @@ export class GameServer {
 
     const now = Date.now();
     for (const [clientID, client] of this.allClients) {
-      if (
-        client.isDisconnected === false &&
-        now - client.lastPing > this.disconnectedTimeout
-      ) {
-        this.markClientDisconnected(client, true);
+      const isDisconnected = this.isClientDisconnected(clientID);
+      if (!isDisconnected && now - client.lastPing > this.disconnectedTimeout) {
+        this.markClientDisconnected(clientID, true);
       } else if (
-        client.isDisconnected &&
+        isDisconnected &&
         now - client.lastPing < this.disconnectedTimeout
       ) {
-        this.markClientDisconnected(client, false);
+        this.markClientDisconnected(clientID, false);
       }
     }
   }
 
-  private markClientDisconnected(client: Client, isDisconnected: boolean) {
-    client.isDisconnected = isDisconnected;
+  public isClientDisconnected(clientID: string): boolean {
+    return this.clientsDisconnectedStatus.get(clientID) ?? true;
+  }
+
+  private markClientDisconnected(clientID: string, isDisconnected: boolean) {
+    this.clientsDisconnectedStatus.set(clientID, isDisconnected);
     this.addIntent({
       type: "mark_disconnected",
-      clientID: client.clientID,
+      clientID: clientID,
       isDisconnected: isDisconnected,
     });
   }