revert(signalr): restore negotiate + auto-transport (CDN now bypassed)

api.bargevasat.ir is now CDN-bypassed (origin answers directly), so the
negotiate POST works again. Drop the WS-only skipNegotiation workaround and use
the standard negotiate flow, which auto-falls back WS → SSE → long-poll if a
WebSocket upgrade isn't available.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lib/online/signalr-service.ts

@@ -141,15 +141,10 @@ export class SignalrService implements OnlineService {
   private async connect(): Promise<void> {
     if (this.conn || !this.token) return;
     const conn = new signalR.HubConnectionBuilder()
-      // Connect straight over WebSockets and SKIP the negotiate POST — some CDNs
-      // (WCDN) 404 the negotiate POST by method. The JWT rides the WS query
-      // string (server reads ?access_token for /hub). Real fix is to bypass the
-      // CDN for api.bargevasat.ir; this is a best-effort fallback.
-      .withUrl(`${SERVER}/hub/game`, {
-        accessTokenFactory: () => this.token ?? "",
-        skipNegotiation: true,
-        transport: signalR.HttpTransportType.WebSockets,
-      })
+      // Normal negotiate flow → auto-picks the best transport (WS, else SSE /
+      // long-poll). Requires api.bargevasat.ir to BYPASS the CDN (WCDN 404s the
+      // negotiate POST); with the CDN bypassed this is the most robust path.
+      .withUrl(`${SERVER}/hub/game`, { accessTokenFactory: () => this.token ?? "" })
       .withAutomaticReconnect()
       .configureLogging(signalR.LogLevel.Warning)
       .build();