build: WebGL last_build 20260518 + fix NetworkManager MapSchema iteration

- New WebGL build (data +6MB, wasm +92KB) with all bug fixes
- Fix MapSchema foreach: iterate via .Keys with explicit casts
- Fix sbyte->int cast for playersAlive Listen callback
- Updated Tutorial.unity scene

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

game/Assets/Scenes/Tutorial.unity

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game/Assets/Scripts/Network/NetworkManager.cs

@@ -154,7 +154,7 @@ public class NetworkManager : MonoBehaviour
         _callbacks.OnRemove(state => state.players, (key, player) => OnPlayerRemove(key, player));
         _callbacks.Listen(state => state.phase, (v, _) => _OnPhaseChanged(v));
         _callbacks.Listen(state => state.countdown, (v, _) => OnCountdownChanged?.Invoke(v));
-        _callbacks.Listen(state => state.playersAlive, (v, _) => GameHUD.Instance?.SetPlayersAlive(v));
+        _callbacks.Listen(state => state.playersAlive, (newVal, oldVal) => { if (GameHUD.Instance != null) GameHUD.Instance.SetPlayersAlive((int)newVal); });
 
         _room.OnMessage<EliminatedMsg>("eliminated", msg => { OnEliminated?.Invoke(msg.sessionId, msg.reason); });
         _room.OnMessage<QualifiedMsg> ("qualified",  msg => { OnQualified?.Invoke(msg.sessionId); });
@@ -167,8 +167,8 @@ public class NetworkManager : MonoBehaviour
         // Seed players already present in the room (state decoded before callbacks were registered)
         if (_room.State.players != null)
         {
-            foreach (var kvp in _room.State.players)
+            foreach (var key in _room.State.players.Keys)
-                OnPlayerAdd(kvp.Key, kvp.Value);
+                OnPlayerAdd((string)key, (NetworkPlayer)_room.State.players[key]);
         }
 
         OnConnected?.Invoke();