app working with sandbox

lib/utils/helpers.dart

@@ -57,3 +57,31 @@ String labelForThemeMode(ThemeMode mode) {
     ThemeMode.system => 'System',
   };
 }
+
+/// Formats a money amount with currency code, e.g. `1 234,56 EUR`.
+String formatMoney(double amount, String currency) {
+  final sign = amount < 0 ? '-' : '';
+  final abs = amount.abs();
+  final fixed = abs.toStringAsFixed(2);
+  final parts = fixed.split('.');
+  final whole = parts[0];
+  final fraction = parts.length > 1 ? parts[1] : '00';
+
+  final buffer = StringBuffer();
+  for (var i = 0; i < whole.length; i++) {
+    final fromEnd = whole.length - i;
+    buffer.write(whole[i]);
+    if (fromEnd > 1 && fromEnd % 3 == 1) {
+      buffer.write('\u00a0');
+    }
+  }
+  return '$sign${buffer.toString()},$fraction $currency';
+}
+
+/// Formats an ISO date string (`yyyy-MM-dd` or full ISO) for list rows.
+String formatIsoDate(String raw) {
+  if (raw.isEmpty) return '';
+  final parsed = DateTime.tryParse(raw);
+  if (parsed == null) return raw;
+  return formatDate(parsed);
+}