Fix UI

Networking/Steam/SteamLobbyService.cs

@@ -378,9 +378,36 @@ namespace MegaKoop.Steam
 
         private void OnRichPresenceJoinRequestedCb(GameRichPresenceJoinRequested_t cb)
         {
-            // Some Steamworks.NET versions expose only m_rgchConnect here.
-            // We cannot reliably parse lobby id across versions; log and rely on GameLobbyJoinRequested_t for lobby joins.
-            Debug.Log("[SteamLobbyService] RichPresence join requested - handle via GameLobbyJoinRequested or custom connect string.");
+            // Parse steam://joinlobby/<appId>/<lobbyId>/<steamId> and join the lobby
+            string conn = cb.m_rgchConnect;
+            if (!string.IsNullOrEmpty(conn))
+            {
+                try
+                {
+                    var s = conn.Trim();
+                    const string prefix = "steam://joinlobby/";
+                    if (s.StartsWith(prefix, StringComparison.OrdinalIgnoreCase))
+                    {
+                        var rest = s.Substring(prefix.Length);
+                        var parts = rest.Split('/');
+                        // Expected: [appId, lobbyId, steamId]
+                        if (parts.Length >= 2)
+                        {
+                            if (ulong.TryParse(parts[1], out var lobbyId))
+                            {
+                                var lobby = new CSteamID(lobbyId);
+                                SteamMatchmaking.JoinLobby(lobby);
+                                return;
+                            }
+                        }
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Debug.LogWarning($"[SteamLobbyService] Failed to parse rich presence connect '{conn}': {ex.Message}");
+                }
+            }
+            Debug.LogWarning($"[SteamLobbyService] RichPresence join requested but could not parse connect '{conn}'.");
         }
         #endregion