fix(matchmaking): broadcast player list so queue avatars appear for all waiting players

BroadcastQueueLocked now sends the full waiting-player list (name/avatar/level)
alongside the count. The client maps it onto mm.players so every queued player's
avatar shows in the 4-slot grid for all waiting users, not just the slot-0 viewer.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/src/Hokm.Server/Game/Contracts.cs

@@ -34,7 +34,8 @@ public record GameStateDto(
     bool Ranked,
     int Stake);
 
-public record MatchmakingStateDto(string Phase, int Players, int? QueuePosition);
+public record QueuePlayerDto(string Id, string Name, string Avatar, string? AvatarImage, int Level);
+public record MatchmakingStateDto(string Phase, int Players, int? QueuePosition, QueuePlayerDto[]? Queue = null);
 public record ReactionDto(int Seat, string Reaction);
 
 public static class Map

server/src/Hokm.Server/Game/GameManager.cs

@@ -88,13 +88,16 @@ public sealed partial class GameManager
         }
     }
 
-    /// <summary>Push the current queue size to every waiting player (call inside _mmLock).</summary>
+    /// <summary>Push the current queue size + player list to every waiting player (call inside _mmLock).</summary>
     private void BroadcastQueueLocked()
     {
-        int n = _waiting.Count;
+        var queue = _waiting
+            .Select(w => new QueuePlayerDto(w.player.UserId, w.player.Name, w.player.Avatar, w.player.AvatarImage, w.player.Level))
+            .ToArray();
+        int n = queue.Length;
         foreach (var w in _waiting)
             _ = _hub.Clients.User(w.player.UserId).SendAsync("matchmaking",
-                new MatchmakingStateDto("searching", n, null));
+                new MatchmakingStateDto("searching", n, null, queue));
     }
 
     /// <summary>Client safety net: re-send the current game state to a player who