feat: Implement Change View and Renderer Options menus

- Added functionality to display and navigate the Change View menu in SixelRenderer and SoftwareRenderer.
- Introduced methods to draw the Change View and Renderer Options menus, including handling cursor and selection states.
- Updated WolfClassicMenuArt to include a customize label for the new menu.
- Enhanced WolfMenuScreen to support new menu states.
- Created tests for Change View menu interactions, ensuring proper transitions and renderer settings toggling.
- Implemented persistence for renderer settings in Flutter, allowing settings to be saved and loaded from a local file.

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

packages/wolf_3d_flutter/lib/renderer_settings_persistence_flutter.dart

@@ -0,0 +1,62 @@
+/// Flutter host adapter for persisting renderer settings to a local file.
+///
+/// Uses `dart:io` for desktop targets where a writable path is available.
+/// On web and other platforms that lack dart:io, persistence is silently
+/// skipped so the rest of the app continues to work normally.
+library;
+
+import 'dart:io';
+
+import 'package:flutter/foundation.dart';
+import 'package:wolf_3d_dart/wolf_3d_engine.dart';
+
+/// Persists [WolfRendererSettings] as JSON to the app's support directory.
+///
+/// This implementation relies on `dart:io` and is therefore only active on
+/// non-web platforms.  Pass an explicit [filePath] during testing.
+class FlutterRendererSettingsPersistence extends RendererSettingsPersistence
+    with JsonRendererSettingsPersistence {
+  FlutterRendererSettingsPersistence({String? filePath}) : _filePath = filePath;
+
+  final String? _filePath;
+  String? _resolvedPath;
+
+  Future<String> _getFilePath() async {
+    if (_resolvedPath != null) {
+      return _resolvedPath!;
+    }
+    if (_filePath != null) {
+      _resolvedPath = _filePath;
+      return _resolvedPath!;
+    }
+    // Resolve platform app-support directory.
+    final String home =
+        Platform.environment['HOME'] ?? Platform.environment['APPDATA'] ?? '.';
+    _resolvedPath = '$home/.wolf3d_settings.json';
+    return _resolvedPath!;
+  }
+
+  @override
+  Future<String?> readRaw() async {
+    if (kIsWeb) return null;
+    try {
+      final String path = await _getFilePath();
+      final File f = File(path);
+      if (!f.existsSync()) return null;
+      return await f.readAsString();
+    } catch (_) {
+      return null;
+    }
+  }
+
+  @override
+  Future<void> writeRaw(String json) async {
+    if (kIsWeb) return;
+    try {
+      final String path = await _getFilePath();
+      await File(path).writeAsString(json, flush: true);
+    } catch (_) {
+      // Best-effort.
+    }
+  }
+}

packages/wolf_3d_flutter/lib/wolf_3d_flutter.dart

@@ -85,6 +85,9 @@ class Wolf3d {
   WolfEngine launchEngine({
     required void Function() onGameWon,
     void Function()? onQuit,
+    WolfRendererCapabilities? rendererCapabilities,
+    WolfRendererSettings? rendererSettings,
+    void Function(WolfRendererSettings settings)? onRendererSettingsChanged,
   }) {
     if (availableGames.isEmpty) {
       throw StateError(
@@ -106,6 +109,9 @@ class Wolf3d {
       // so backing out of the top-level menu should not pop the route.
       onMenuExit: () {},
       onQuit: onQuit,
+      rendererCapabilities: rendererCapabilities,
+      rendererSettings: rendererSettings,
+      onRendererSettingsChanged: onRendererSettingsChanged,
       onGameSelected: (game) {
         _activeGame = game;
         audio.activeGame = game;