fix(swift-example-app): silent no-op for Platform sync without a wallet

packages/swift-sdk/SwiftExampleApp/SwiftExampleApp/Core/Services/PlatformBalanceSyncService.swift

@@ -199,8 +199,18 @@ class PlatformBalanceSyncService: ObservableObject {
     /// Perform the actual BLAST address sync via platform-wallet.
     func performSync() async {
         guard !isSyncing else { return }
+        // Silent no-op when the active network has no wallet bound
+        // yet (e.g. the user just switched to a network they
+        // haven't created a wallet on, or pull-to-refreshed an
+        // empty Wallets tab). The previous behavior surfaced
+        // "Platform address wallet not configured" in red, which
+        // reads like a setup bug rather than the benign empty
+        // state it actually is. Callers gate their entry points
+        // (Sync Now button, .refreshable) on the presence of a
+        // wallet too, so reaching here without one is best-effort
+        // safety for race-y dispatches.
         guard let walletManager = walletManager else {
-            lastError = "Platform address wallet not configured"
+            lastError = nil
             return
         }
 

packages/swift-sdk/SwiftExampleApp/SwiftExampleApp/Core/Views/CoreContentView.swift

@@ -330,7 +330,18 @@ var body: some View {
                         .buttonStyle(.borderedProminent)
                         .tint(.blue)
                         .controlSize(.mini)
-                        .disabled(platformBalanceSyncService.isSyncing)
+                        // Disable when there's nothing to sync —
+                        // either an active sync is already in
+                        // flight, or the active network has no
+                        // wallet bound to drive BLAST against. The
+                        // service itself short-circuits to a no-op
+                        // in that second case, but disabling the
+                        // button keeps the UI honest about whether
+                        // a tap will do anything.
+                        .disabled(
+                            platformBalanceSyncService.isSyncing
+                                || walletManager.firstWallet == nil
+                        )
 
                         Button {
                             platformBalanceSyncService.clearDisplay()