look aheead limit defined by user

lib/screens/settings_screen.dart

@@ -8,6 +8,7 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 import '../providers/bank_provider.dart';
+import '../providers/preferences_provider.dart';
 import '../providers/theme_provider.dart';
 import '../utils/connect_bank.dart';
 import '../utils/constants.dart';
@@ -110,6 +111,7 @@ class SettingsScreen extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final themeController = context.watch<ThemeController>();
+    final prefs = context.watch<PreferencesController>();
     final bank = context.watch<BankController>();
     final theme = Theme.of(context);
 
@@ -150,6 +152,31 @@ class SettingsScreen extends StatelessWidget {
               },
             ),
             const SizedBox(height: 28),
+            Text('Look ahead', style: theme.textTheme.titleMedium),
+            const SizedBox(height: 8),
+            Card(
+              child: ListTile(
+                leading: const Icon(Icons.event_repeat_outlined),
+                title: const Text('Projection horizon'),
+                subtitle: Text(
+                  'Navigate up to ${prefs.lookAheadMaxYears} year'
+                  '${prefs.lookAheadMaxYears == 1 ? '' : 's'} ahead',
+                ),
+                trailing: DropdownButton<int>(
+                  value: prefs.lookAheadMaxYears,
+                  underline: const SizedBox.shrink(),
+                  items: [
+                    for (final y in const [1, 2, 3, 5, 7, 10, 15, 20, 30])
+                      DropdownMenuItem(value: y, child: Text('$y')),
+                  ],
+                  onChanged: (value) {
+                    if (value == null) return;
+                    prefs.setLookAheadMaxYears(value);
+                  },
+                ),
+              ),
+            ),
+            const SizedBox(height: 28),
             Text('Backend', style: theme.textTheme.titleMedium),
             const SizedBox(height: 8),
             Card(