feat(staking): prepare for Polkadot 2.0 nomination pools on Asset Hub

- ChainExt.kt: Handle nomination-pools without local backing type (Polkadot 2.0)
- Add hasLocalNominationPoolsBacking() helper function
- Default to RELAYCHAIN when no local backing type exists
- StakingDashboardUpdateSystem: Improved error logging
- StakingDashboardViewModel: Show toast when item is syncing
- Update chains.json: relay chain only has relaychain staking

feature-staking-impl/src/main/java/io/novafoundation/nova/feature_staking_impl/data/dashboard/network/updaters/StakingDashboardUpdateSystem.kt

@@ -90,8 +90,8 @@ class RealStakingDashboardUpdateSystem(
                     sharedRequestsBuilder.subscribe(accountScope)
 
                     chainUpdates.mergeIfMultiple()
-                }.catch {
-                    Log.d("StakingDashboardUpdateSystem", "Failed to sync staking dashboard status for ${stakingChain.name}")
+                }.catch { e ->
+                    Log.e("StakingDashboardUpdateSystem", "Failed to sync staking dashboard status for ${stakingChain.name}", e)
                 }
             }
 

feature-staking-impl/src/main/java/io/novafoundation/nova/feature_staking_impl/domain/nominationPools/ChainExt.kt

@@ -2,6 +2,24 @@ package io.novafoundation.nova.feature_staking_impl.domain.nominationPools
 
 import io.novafoundation.nova.runtime.multiNetwork.chain.model.Chain
 
+/**
+ * Finds the staking type that backs nomination pools.
+ *
+ * In Polkadot 1.0: Both relaychain and nomination-pools exist on the same chain
+ * In Polkadot 2.0: nomination-pools may exist on Asset Hub without local backing type
+ *                  (backing is via XCM from relay chain)
+ *
+ * @return The backing staking type, or RELAYCHAIN as default for Polkadot 2.0 compatibility
+ */
 fun Chain.Asset.findStakingTypeBackingNominationPools(): Chain.Asset.StakingType {
-    return staking.first { it != Chain.Asset.StakingType.NOMINATION_POOLS }
+    return staking.firstOrNull { it != Chain.Asset.StakingType.NOMINATION_POOLS }
+        ?: Chain.Asset.StakingType.RELAYCHAIN  // Polkadot 2.0: default to RELAYCHAIN for Asset Hub
+}
+
+/**
+ * Checks if this asset has nomination pools backed by a local staking type.
+ * Returns false for Polkadot 2.0 Asset Hub where backing is cross-chain.
+ */
+fun Chain.Asset.hasLocalNominationPoolsBacking(): Boolean {
+    return staking.any { it != Chain.Asset.StakingType.NOMINATION_POOLS }
 }

feature-staking-impl/src/main/java/io/novafoundation/nova/feature_staking_impl/presentation/dashboard/main/StakingDashboardViewModel.kt

@@ -102,7 +102,13 @@ class StakingDashboardViewModel(
     fun onNoStakeItemClicked(index: Int) = launch {
         val withoutStakeItems = stakingDashboardFlow.firstLoaded().withoutStake
         val withoutStakeItem = withoutStakeItems.getOrNull(index) ?: return@launch
-        val noStakeItemState = withoutStakeItem.stakingState as? NoStake ?: return@launch
+        val noStakeItemState = withoutStakeItem.stakingState as? NoStake
+
+        if (noStakeItemState == null) {
+            // Item is still syncing (NotYetResolved state)
+            showToast(resourceManager.getString(R.string.staking_dashboard_syncing))
+            return@launch
+        }
 
         val stakingTypes = noStakeItemState.flowType.allStakingTypes
         val chain = withoutStakeItem.chain