revised image asset structure

pi/ui/lib/main.dart

@@ -21,7 +21,6 @@ class SmartSerowApp extends StatelessWidget {
         ),
         useMaterial3: true,
         fontFamily: 'DIN1451',
-        fontFamilyFallback: const ['NotoSans', 'Roboto'],
       ),
       home: const AppRoot(),
     );

pi/ui/lib/screens/dashboard_screen.dart

@@ -1,7 +1,9 @@
 import 'dart:async';
+import 'dart:io';
 import 'dart:math';
 import 'package:flutter/material.dart';
 
+import '../services/config_service.dart';
 import '../services/pi_io.dart';
 import '../widgets/stat_box.dart';
 
@@ -46,6 +48,21 @@ class _DashboardScreenState extends State<DashboardScreen> {
     super.dispose();
   }
 
+  /// Build navigator image from filesystem
+  Widget _buildNavigatorImage() {
+    final config = ConfigService.instance;
+    final imagePath = '${config.assetsPath}/navigator/${config.navigator}/default.png';
+
+    return Image.file(
+      File(imagePath),
+      fit: BoxFit.contain,
+      errorBuilder: (context, error, stackTrace) {
+        // Graceful fallback - empty box if image missing
+        return const SizedBox.shrink();
+      },
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -127,14 +144,7 @@ class _DashboardScreenState extends State<DashboardScreen> {
             Expanded(
               flex: 1,
               child: Center(
-                child: Image.asset(
-                  'assets/images/rei_default.png',
-                  fit: BoxFit.contain,
-                  errorBuilder: (context, error, stackTrace) {
-                    // Graceful fallback - empty box if image missing
-                    return const SizedBox.shrink();
-                  },
-                ),
+                child: _buildNavigatorImage(),
               ),
             ),
           ],

pi/ui/lib/services/config_service.dart

@@ -16,6 +16,10 @@ class ConfigService {
   static const double _defaultThreshold = 80.0;
   static const int _defaultTriggerDuration = 10;
   static const int _defaultShutdownDelay = 10;
+  static const String _defaultNavigator = 'rei';
+
+  // Executable directory (for fallback paths)
+  late final String _exeDir;
 
   /// Load config from JSON file
   ///
@@ -24,11 +28,12 @@ class ConfigService {
   Future<void> load() async {
     if (_loaded) return;
 
+    // Config file sits next to the executable
+    final exePath = Platform.resolvedExecutable;
+    _exeDir = File(exePath).parent.path;
+
     try {
-      // Config file sits next to the executable
-      final exePath = Platform.resolvedExecutable;
-      final exeDir = File(exePath).parent.path;
-      final configPath = '$exeDir${Platform.pathSeparator}config.json';
+      final configPath = '$_exeDir${Platform.pathSeparator}config.json';
 
       final file = File(configPath);
       if (await file.exists()) {
@@ -66,4 +71,19 @@ class ConfigService {
     if (value is int) return Duration(seconds: value);
     return Duration(seconds: _defaultShutdownDelay);
   }
+
+  /// Path to external assets directory
+  String get assetsPath {
+    final value = _config?['assets_path'];
+    if (value is String && value.isNotEmpty) return value;
+    // Fallback: assets/ next to executable
+    return '$_exeDir${Platform.pathSeparator}assets';
+  }
+
+  /// Navigator character name (subfolder in assets/navigator/)
+  String get navigator {
+    final value = _config?['navigator'];
+    if (value is String && value.isNotEmpty) return value;
+    return _defaultNavigator;
+  }
 }