fix(withdrawals): remove duplicate executeWithdrawal method

packages/komodo_defi_sdk/lib/src/withdrawals/legacy_withdrawal_manager.dart

@@ -195,71 +195,6 @@ class LegacyWithdrawalManager implements WithdrawalManager {
     }
   }
 
-  /// Execute a withdrawal from a previously generated preview.
-  ///
-  /// This method broadcasts the pre-signed transaction from the preview,
-  /// avoiding the need to sign the transaction again. This is the ONLY
-  /// recommended way to execute withdrawals for Tendermint assets.
-  ///
-  /// Parameters:
-  /// - [preview] - The preview result from [previewWithdrawal]
-  /// - [assetId] - The asset identifier (coin symbol)
-  ///
-  /// Returns a [Stream<WithdrawalProgress>] that emits progress updates.
-  @override
-  Stream<WithdrawalProgress> executeWithdrawal(
-    WithdrawalPreview preview,
-    String assetId,
-  ) async* {
-    try {
-      // Initial progress update
-      yield WithdrawalProgress(
-        status: WithdrawalStatus.inProgress,
-        message: 'Broadcasting signed transaction...',
-        withdrawalResult: WithdrawalResult(
-          txHash: preview.txHash,
-          balanceChanges: preview.balanceChanges,
-          coin: assetId,
-          toAddress: preview.to.first,
-          fee: preview.fee,
-          kmdRewardsEligible:
-              preview.kmdRewards != null &&
-              Decimal.parse(preview.kmdRewards!.amount) > Decimal.zero,
-        ),
-      );
-
-      // Broadcast the pre-signed transaction
-      final broadcastResponse = await _client.rpc.withdraw.sendRawTransaction(
-        coin: assetId,
-        txHex: preview.txHex,
-        txJson: preview.txJson,
-      );
-
-      // Final success update with actual broadcast transaction hash
-      yield WithdrawalProgress(
-        status: WithdrawalStatus.complete,
-        message: 'Withdrawal completed successfully',
-        withdrawalResult: WithdrawalResult(
-          txHash: broadcastResponse.txHash,
-          balanceChanges: preview.balanceChanges,
-          coin: assetId,
-          toAddress: preview.to.first,
-          fee: preview.fee,
-          kmdRewardsEligible:
-              preview.kmdRewards != null &&
-              Decimal.parse(preview.kmdRewards!.amount) > Decimal.zero,
-        ),
-      );
-    } catch (e) {
-      yield* Stream.error(
-        WithdrawalException(
-          'Failed to broadcast transaction: $e',
-          WithdrawalErrorCode.networkError,
-        ),
-      );
-    }
-  }
-
   /// No-op for legacy implementation since there's no task to cancel
   @override
   Future<bool> cancelWithdrawal(int taskId) async => false;