update

lib/shared/providers/amount_format_provider.dart

@@ -0,0 +1,25 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import '../../core/constants.dart';
+
+class AmountFormatNotifier extends StateNotifier<AmountFormat> {
+  AmountFormatNotifier() : super(AmountFormat.commasDot) {
+    _load();
+  }
+
+  void _load() async {
+    final prefs = await SharedPreferences.getInstance();
+    final index = prefs.getInt('amount_format') ?? 0;
+    state = AmountFormat.values[index];
+  }
+
+  void set(AmountFormat format) async {
+    final prefs = await SharedPreferences.getInstance();
+    state = format;
+    await prefs.setInt('amount_format', format.index);
+  }
+}
+
+final amountFormatProvider = StateNotifierProvider<AmountFormatNotifier, AmountFormat>(
+  (ref) => AmountFormatNotifier(),
+);

lib/shared/utils/currency_utils.dart

@@ -1,9 +1,9 @@
-String formatAmount(String symbol, double amount) {
+import '../../core/constants.dart';
+
+String formatAmount(String symbol, double amount, AmountFormat fmt) {
   // Symbols that need a space after them (prefix symbols like Br, ₽ etc.)
   const spaceAfter = {'Br', '₽'};
-  final formatted = amount.toStringAsFixed(2);
-  if (spaceAfter.contains(symbol)) {
-    return '$symbol $formatted';
-  }
-  return '$symbol$formatted';
+  final formatted = fmt.format(amount);
+  final sep = spaceAfter.contains(symbol) ? ' ' : '';
+  return '$symbol$sep$formatted';
 }