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>

src/lib/online/signalr-service.ts

@@ -159,8 +159,9 @@ export class SignalrService implements OnlineService {
       .configureLogging(signalR.LogLevel.Warning)
       .build();
 
-    conn.on("matchmaking", (s: { phase: string; players: number; queuePosition: number | null }) =>
-      this.emitMM(s.phase, s.queuePosition ?? undefined, s.players));
+    conn.on("matchmaking", (s: { phase: string; players: number; queuePosition: number | null; queue?: Array<{ id: string; name: string; avatar: string; avatarImage?: string; level: number }> }) =>
+      this.emitMM(s.phase, s.queuePosition ?? undefined, s.players,
+        s.queue?.map(p => ({ id: p.id, displayName: p.name, avatar: p.avatar, avatarImage: p.avatarImage, level: p.level, rating: 0 }))));
     conn.on("matchFound", () => {
       this.emitMM("ready");
       // Safety net: if the initial state never lands (dropped/raced), ask the
@@ -226,10 +227,15 @@ export class SignalrService implements OnlineService {
     }
   }
 
-  private emitMM(phase: string, queuePosition?: number, waiting?: number) {
+  private emitMM(
+    phase: string,
+    queuePosition?: number,
+    waiting?: number,
+    queuePlayers?: Array<{ id: string; displayName: string; avatar: string; avatarImage?: string; level: number; rating: number }>
+  ) {
     const state: MatchmakingState = {
       phase: phase as MatchmakingState["phase"],
-      players: [],
+      players: queuePlayers ?? [],
       elapsedMs: 0,
       ranked: this.mmRanked,
       stake: this.mmStake,