fix: comprehensive chess gameplay fixes

- BoardManager: always PlacePieces() in Start() (traditional chess first,
  campaign can override via SetupBoard)
- Piece.ShowMoves: filter by legal moves only (MoveValidator.IsMoveLegal)
- SquareClick: null checks + GameState.Playing guard
- DialogueSystem: WaitForSecondsRealtime for typewriter (survives timeScale=0)
- GameManager: add IsMoveLegal public method for Piece.ShowMoves
- GameManager: en passant fires OnPieceCaptured BEFORE Destroy
- GameHUD: delegate pause to PauseMenuController (no direct timeScale)

Assets/Game/Scripts/Mono/BoardManager.cs

@@ -57,11 +57,9 @@ public GameObject kingPrefab; // Prefab del Rey usado como "jefe" en el purgator
         GenerateBoard();
         GenerateIndicators();
         
-        // Skip standard piece placement if CampaignManager will call SetupBoard
-        if (CampaignManager.Instance == null || !CampaignManager.Instance.IsCampaignActive)
-        {
-            PlacePieces();
-        }
+        // Always place standard pieces for traditional chess.
+        // CampaignManager.SetupBoard() can override later if needed.
+        PlacePieces();
     }
     
     /// <summary>

Assets/Game/Scripts/Mono/Core/DialogueSystem.cs

@@ -177,7 +177,7 @@ public class DialogueSystem : MonoBehaviour
             
             if (i < fullText.Length)
             {
-                yield return new WaitForSeconds(delay);
+                yield return new WaitForSecondsRealtime(delay);
             }
         }
         

Assets/Game/Scripts/Mono/GameManager.cs

@@ -207,8 +207,17 @@ public class GameManager : MonoBehaviour
             if (enPassantCaptured != null)
             {
                 isEnPassant = true;
-                Destroy(enPassantCaptured.gameObject);
+
+                // En Passant: gestionar captura especial (event BEFORE destroy)
+                if (enPassantCaptured.isWhite && enPassantCaptured.identity != null)
+                {
+                    if (PurgatoryManager.Instance != null)
+                        PurgatoryManager.Instance.OnPieceCaptured(enPassantCaptured.identity);
+                }
+                OnPieceCaptured?.Invoke(enPassantCaptured);
+
                 _board[newPos.x, captureY] = null;
+                Destroy(enPassantCaptured.gameObject);
             }
         }
 
@@ -234,20 +243,6 @@ public class GameManager : MonoBehaviour
             Destroy(captured.gameObject);
         }
         
-        // En Passant: gestionar captura especial
-        if (isEnPassant && enPassantCaptured != null && enPassantCaptured.isWhite && enPassantCaptured.identity != null)
-        {
-            if (PurgatoryManager.Instance != null)
-            {
-                PurgatoryManager.Instance.OnPieceCaptured(enPassantCaptured.identity);
-            }
-        }
-        
-        if (isEnPassant && enPassantCaptured != null)
-        {
-            OnPieceCaptured?.Invoke(enPassantCaptured);
-        }
-        
         // Mover pieza
         _board[oldPos.x, oldPos.y] = null;
         _board[newPos.x, newPos.y] = piece;
@@ -443,6 +438,16 @@ private GameObject GetPrefabForPromotion(PieceType type, bool isWhite)
         return _checkDetector.IsInCheck(_board, forWhite);
     }
 
+    /// <summary>
+    /// Verifica si un movimiento es legal (in bounds, pseudo-legal, y no deja al rey en jaque).
+    /// Usado por ShowMoves para filtrar indicadores.
+    /// </summary>
+    public bool IsMoveLegal(Piece piece, Vector2Int targetPos)
+    {
+        if (piece == null) return false;
+        return _moveValidator.IsMoveLegal(_board, piece, targetPos);
+    }
+
     /// <summary>
     /// Verifica si un jugador está en jaque mate.
     /// </summary>

Assets/Game/Scripts/Mono/Pieces/Piece.cs

@@ -70,11 +70,16 @@ public class Piece : MonoBehaviour
         if (GameManager.Instance == null || BoardManager.Instance == null)
             return;
         
-        var moves = GetAvailableMoves(GameManager.Instance.board);
         BoardManager.Instance.HideAllIndicators();
-        foreach (var move in moves)
+        
+        // Get legal moves (filtered: won't leave king in check)
+        var allMoves = GetAvailableMoves(GameManager.Instance.board);
+        foreach (var move in allMoves)
         {
-            BoardManager.Instance.ShowIndicator(move);
+            if (GameManager.Instance.IsMoveLegal(this, move))
+            {
+                BoardManager.Instance.ShowIndicator(move);
+            }
         }
     }
 

Assets/Game/Scripts/Mono/SquareClick.cs

@@ -6,6 +6,12 @@ public class SquareClick : MonoBehaviour
 
     void OnMouseDown()
     {
+        if (GameManager.Instance == null) return;
+
+        // Don't process clicks during dialogue, purgatory, or game over
+        if (GameStateManager.Instance != null && GameStateManager.Instance.CurrentState != GameState.Playing)
+            return;
+
         Piece piece = GameManager.Instance.board[position.x, position.y];
 
         if (piece != null && piece.isWhite == GameManager.Instance.whiteTurn)

Assets/Game/Scripts/Mono/UI/GameHUD.cs

@@ -228,10 +228,11 @@ namespace AjedrezPurgatorio.UI
             if (_enableDebugLogging)
                 Debug.Log("[GameHUD] Pause button clicked.");
 
-            // Pause the game
-            Time.timeScale = 0f;
-            
-            // Find and show pause menu
+            // Don't double-pause
+            PauseMenuController existing = FindObjectOfType<PauseMenuController>();
+            if (existing != null && existing.gameObject.activeInHierarchy) return;
+
+            // Find and show pause menu (it manages timeScale)
             PauseMenuController pauseMenu = FindObjectOfType<PauseMenuController>();
             if (pauseMenu != null)
             {