real time dark mode switching

lib/main.dart

@@ -33,8 +33,7 @@ class MyApp extends StatelessWidget {
             title: 'LBA',
             theme: themeManager.lightTheme,
             darkTheme: themeManager.darkTheme,
-            themeMode:
-                themeManager.isDarkMode ? ThemeMode.dark : ThemeMode.light,
+            themeMode: themeManager.getThemeMode(),
             themeAnimationDuration: const Duration(milliseconds: 300),
             themeAnimationCurve: Curves.easeInOutCubic,
             home: SplashScreen(
@@ -47,3 +46,4 @@ class MyApp extends StatelessWidget {
     );
   }
 }
+

lib/utils/theme_manager.dart

@@ -1,10 +1,13 @@
+
+
+
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:lba/res/colors.dart';
 import 'package:lba/utils/sharedPreferencesKey.dart';
 import 'package:lba/utils/sharedPreferencesManger.dart';
 
-class ThemeManager extends ChangeNotifier {
+class ThemeManager extends ChangeNotifier with WidgetsBindingObserver {
   late SharedPreferencesManager _prefs;
   bool _isDarkMode = false;
   bool _isThemeTransitioning = false;
@@ -13,6 +16,13 @@ class ThemeManager extends ChangeNotifier {
   ThemeManager() {
     _prefs = SharedPreferencesManager();
     _loadTheme();
+    WidgetsBinding.instance.addObserver(this);
+  }
+
+  @override
+  void dispose() {
+    WidgetsBinding.instance.removeObserver(this);
+    super.dispose();
   }
 
   bool get isDarkMode => _isDarkMode;
@@ -160,6 +170,31 @@ class ThemeManager extends ChangeNotifier {
 
   ThemeData get currentTheme => _isDarkMode ? darkTheme : lightTheme;
 
+  /// Returns the appropriate ThemeMode based on user preferences
+  ThemeMode getThemeMode() {
+    if (_hasManualOverride) {
+      return _isDarkMode ? ThemeMode.dark : ThemeMode.light;
+    } else {
+      return ThemeMode.system;
+    }
+  }
+
+  @override
+  void didChangePlatformBrightness() {
+    super.didChangePlatformBrightness();
+    
+    // Only respond to system theme changes if user hasn't manually overridden
+    if (!_hasManualOverride) {
+      bool systemIsDark = _getSystemTheme();
+      if (_isDarkMode != systemIsDark) {
+        _isDarkMode = systemIsDark;
+        AppColors.setDarkMode(_isDarkMode);
+        _updateSystemUIOverlay();
+        notifyListeners();
+      }
+    }
+  }
+
   Future<void> _loadTheme() async {
     await _prefs.init();
     _hasManualOverride = _prefs.getBool(SharedPreferencesKey.hasManualThemeOverride) ?? false;
@@ -176,8 +211,7 @@ class ThemeManager extends ChangeNotifier {
   }
 
   bool _getSystemTheme() {
-    final window = WidgetsBinding.instance.window;
-    return window.platformBrightness == Brightness.dark;
+    return WidgetsBinding.instance.platformDispatcher.platformBrightness == Brightness.dark;
   }
 
   void _updateSystemUIOverlay() {