Fix cross-chain XCM config parsing for destination field

The XCM config JSON has a nested structure where chainId and assetId
are inside a "destination" object, but the Kotlin class expected them
at the root level. This was causing NullPointerException when parsing
cross-chain transfer configurations.

Changes:
- Add XcmTransferDestinationRemote class to represent nested destination
- Update DynamicXcmTransferRemote to use destination object instead of
  flat chainId/assetId fields
- Update Dynamic.kt mapping to access transfer.destination.chainId/assetId

This fixes cross-chain transfers between Pezkuwi, Pezkuwi Asset Hub,
and Pezkuwi People chains.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

feature-wallet-impl/src/main/java/io/novafoundation/nova/feature_wallet_impl/data/mappers/crosschain/Dynamic.kt

@@ -63,7 +63,10 @@ private fun constructTransfersForChain(configRemote: DynamicCrossChainOriginChai
             assetId = assetConfig.assetId,
             destinations = assetConfig.xcmTransfers.map { transfer ->
                 TransferDestination(
-                    fullChainAssetId = FullChainAssetId(transfer.chainId, transfer.assetId),
+                    fullChainAssetId = FullChainAssetId(
+                        transfer.destination.chainId,
+                        transfer.destination.assetId
+                    ),
                     hasDeliveryFee = transfer.hasDeliveryFee ?: false,
                     supportsXcmExecute = transfer.supportsXcmExecute ?: false,
                 )

feature-wallet-impl/src/main/java/io/novafoundation/nova/feature_wallet_impl/data/network/crosschain/dynamic/DynamicCrossChainConfigRemote.kt

@@ -33,8 +33,13 @@ class DynamicCrossChainOriginAssetRemote(
 )
 
 class DynamicXcmTransferRemote(
-    val chainId: ChainId,
-    val assetId: Int,
+    val destination: XcmTransferDestinationRemote,
+    val type: String?,
     val hasDeliveryFee: Boolean?,
     val supportsXcmExecute: Boolean?,
 )
+
+class XcmTransferDestinationRemote(
+    val chainId: ChainId,
+    val assetId: Int,
+)