fix alternative castling

lib/src/model/common/node.dart

@@ -1,5 +1,6 @@
 import 'package:collection/collection.dart';
 import 'package:dartchess/dartchess.dart';
+import 'package:dartchess/src/utils.dart';
 import 'package:fast_immutable_collections/fast_immutable_collections.dart';
 import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:lichess_mobile/src/model/common/chess.dart';
@@ -192,17 +193,23 @@ abstract class Node {
     bool prepend = false,
   }) {
     final pos = nodeAt(path).position;
-    final (newPos, newSan) = pos.makeSan(convertAltCastlingMove(move) ?? move);
+    final convertedMove = convertAltCastlingMove(pos, move);
+    final (newPos, newSan) = pos.makeSan(convertedMove!);
     final newNode = Branch(
-      sanMove: SanMove(newSan, convertAltCastlingMove(move) ?? move),
+      sanMove: SanMove(newSan, convertedMove),
       position: newPos,
     );
     return addNodeAt(path, newNode, prepend: prepend);
   }
 
   /// The function `convertAltCastlingMove` checks if a move is an alternative
   /// castling move and converts it to the corresponding standard castling move if so.
-  Move? convertAltCastlingMove(Move move) {
+  Move? convertAltCastlingMove(Position pos, Move move) {
+    final isKingMove =
+        pos.board.roleAt(parseSquare(move.uci.substring(0, 2)) ?? 0) ==
+            Role.king;
+    if (!isKingMove) return move;
+
     return altCastles.containsValue(move.uci)
         ? Move.fromUci(
             altCastles.entries.firstWhere((e) => e.value == move.uci).key,