Feature: Add feature toggles and settings for modular features (e.g., Car, Inventory), enhance navigation for mobile/desktop, and improve i18n integration.

finlog_app/app/lib/core/features/feature_controller.dart

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+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:fluttery/fluttery.dart';
+import 'package:fluttery/preferences.dart';
+import 'package:app/core/i18n/translations.g.dart';
+
+/// Define all toggleable features here.
+/// You can freely add more later.
+enum AppFeature {
+  inventory,
+  car,
+  household, // incl. budget
+  reports,
+}
+
+extension AppFeatureKey on AppFeature {
+  String get prefKey {
+    switch (this) {
+      case AppFeature.inventory:
+        return 'feature.inventory.enabled';
+      case AppFeature.car:
+        return 'feature.car.enabled';
+      case AppFeature.household:
+        return 'feature.household.enabled';
+      case AppFeature.reports:
+        return 'feature.reports.enabled';
+    }
+  }
+
+  /// Optional: default state if the pref isn't set yet
+  bool get defaultEnabled {
+    switch (this) {
+      case AppFeature.inventory:
+        return true;
+      case AppFeature.car:
+        return false;
+      case AppFeature.household:
+        return true;
+      case AppFeature.reports:
+        return true;
+    }
+  }
+
+  /// Human-readable name for UI using translations
+  String displayName(BuildContext context) {
+    final t = Translations.of(context);
+    switch (this) {
+      case AppFeature.inventory:
+        return t.features.inventory.displayName;
+      case AppFeature.car:
+        return t.features.car.displayName;
+      case AppFeature.household:
+        return t.features.household.displayName;
+      case AppFeature.reports:
+        return t.features.reports.displayName;
+    }
+  }
+
+  /// Description/help text shown below the switch using translations
+  String description(BuildContext context) {
+    final t = Translations.of(context);
+    switch (this) {
+      case AppFeature.inventory:
+        return t.features.inventory.description;
+      case AppFeature.car:
+        return t.features.car.description;
+      case AppFeature.household:
+        return t.features.household.description;
+      case AppFeature.reports:
+        return t.features.reports.description;
+    }
+  }
+
+  /// Optional: an icon to show in list tiles (import material in the view)
+}
+
+/// Controller pattern like your other controllers (ChangeNotifier + init)
+class FeatureController extends ChangeNotifier {
+  final Preferences _prefs;
+
+  FeatureController() : _prefs = App.service<Preferences>();
+
+  /// In-memory cache of feature states
+  final Map<AppFeature, bool> _enabled = {
+    for (final f in AppFeature.values) f: f.defaultEnabled,
+  };
+
+  /// Call during app bootstrap (similar to other controllers).
+  Future<void> init() async {
+    for (final f in AppFeature.values) {
+      final v = await _prefs.getBool(f.prefKey);
+      _enabled[f] = v ?? true;
+    }
+  }
+
+  bool isEnabled(AppFeature feature) =>
+      _enabled[feature] ?? feature.defaultEnabled;
+
+  /// Convenience map for UI bindings
+  Map<AppFeature, bool> get allStates => Map.unmodifiable(_enabled);
+
+  Future<void> setEnabled(AppFeature feature, bool value) async {
+    _enabled[feature] = value;
+    await _prefs.setBool(feature.prefKey, value);
+    notifyListeners();
+  }
+
+  /// Optional helper: filter routes/features in the app shell, etc.
+  bool get hasInventory => isEnabled(AppFeature.inventory);
+
+  bool get hasCar => isEnabled(AppFeature.car);
+
+  bool get hasHousehold => isEnabled(AppFeature.household);
+
+  bool get hasReports => isEnabled(AppFeature.reports);
+}