look aheead limit defined by user

lib/providers/preferences_provider.dart

@@ -0,0 +1,26 @@
+/// App preferences beyond theme (Look ahead horizon, etc.).
+library;
+
+import 'package:flutter/foundation.dart';
+
+import '../services/storage_service.dart';
+
+class PreferencesController extends ChangeNotifier {
+  PreferencesController(this._storage) {
+    _lookAheadMaxYears = _storage.lookAheadMaxYears;
+  }
+
+  final StorageService _storage;
+  late int _lookAheadMaxYears;
+
+  /// Years ahead Look ahead can navigate (1–30, default 5).
+  int get lookAheadMaxYears => _lookAheadMaxYears;
+
+  Future<void> setLookAheadMaxYears(int years) async {
+    final next = years.clamp(1, 30);
+    if (next == _lookAheadMaxYears) return;
+    _lookAheadMaxYears = next;
+    notifyListeners();
+    await _storage.setLookAheadMaxYears(next);
+  }
+}