use material dynamic color scheme

app/lib/core/error_observer.dart

@@ -0,0 +1,16 @@
+import 'package:bang_navigator/core/logger.dart';
+import 'package:riverpod/riverpod.dart';
+
+class ErrorObserver extends ProviderObserver {
+  const ErrorObserver();
+
+  @override
+  void providerDidFail(
+    ProviderBase<Object?> provider,
+    Object error,
+    StackTrace stackTrace,
+    ProviderContainer container,
+  ) {
+    logger.e('Provider $provider threw $error at $stackTrace');
+  }
+}