fix: log and stop swallowing synchronous listenForUpdates() failures; retry NDK download in CI

BalancesUpdateSystem.launchChainUpdaters() wrapped updater.listenForUpdates() in a
try/catch that discarded synchronous exceptions with zero logging - a silent failure
point that could explain a chain's balances never syncing with no trace in logcat.

Also add a full-architecture instrumented test that persists a real watch-only
MetaAccount and polls AssetDao through the actual BalancesUpdateSystem pipeline,
instead of bypassing it like the existing BalancesIntegrationTest does.

feature-assets/src/main/java/io/novafoundation/nova/feature_assets/data/network/BalancesUpdateSystem.kt

@@ -45,6 +45,11 @@ class BalancesUpdateSystem(
     }
 
     private suspend fun balancesSync(chain: Chain, metaAccount: MetaAccount): Flow<Updater.SideEffect> {
+        Log.d(
+            "BalancesDiag",
+            "balancesSync(${chain.name}): hasAccountIn=${metaAccount.hasAccountIn(chain)} " +
+                "isDisabled=${chain.connectionState.isDisabled} canPerformFullSync=${chain.canPerformFullSync()}"
+        )
         return when {
             !metaAccount.hasAccountIn(chain) -> emptyFlow()
             chain.connectionState.isDisabled -> emptyFlow()
@@ -89,6 +94,10 @@ class BalancesUpdateSystem(
                 try {
                     updater.listenForUpdates(subscriptionBuilder, metaAccount).catch { logError(chain, it) }
                 } catch (e: Exception) {
+                    // Was silently swallowed here with zero logging - listenForUpdates() itself is a suspend
+                    // call that can throw synchronously (e.g. FullSyncPaymentUpdater.listenForUpdates() calling
+                    // requireAccountIdIn(chain)), before ever returning a flow for the .catch{} above to guard.
+                    Log.e("BalancesDiag", "listenForUpdates() threw synchronously for ${updater.javaClass.simpleName} in ${chain.name}", e)
                     emptyFlow()
                 }
             }