fix #61

lib/foundation/app.dart

@@ -63,22 +63,9 @@ class _App {
     }
   }
 
-  var mainColor = Colors.blue;
-
   Future<void> init() async {
     cachePath = (await getApplicationCacheDirectory()).path;
     dataPath = (await getApplicationSupportDirectory()).path;
-    mainColor = switch (appdata.settings['color']) {
-      'red' => Colors.red,
-      'pink' => Colors.pink,
-      'purple' => Colors.purple,
-      'green' => Colors.green,
-      'orange' => Colors.orange,
-      'blue' => Colors.blue,
-      'yellow' => Colors.yellow,
-      'cyan' => Colors.cyan,
-      _ => Colors.blue,
-    };
   }
 
   Function? _forceRebuildHandler;

lib/foundation/appdata.dart

@@ -92,7 +92,7 @@ class _Settings with ChangeNotifier {
   final _data = <String, dynamic>{
     'comicDisplayMode': 'detailed', // detailed, brief
     'comicTileScale': 1.00, // 0.75-1.25
-    'color': 'blue', // red, pink, purple, green, orange, blue
+    'color': 'system', // red, pink, purple, green, orange, blue
     'theme_mode': 'system', // light, dark, system
     'newFavoriteAddTo': 'end', // start, end
     'moveFavoriteAfterRead': 'none', // none, end, start