Add launch configuration, update API keys, and refactor UI components for better structure and performance

lib/providers/theme_provider.dart

@@ -8,7 +8,7 @@ class ThemeProvider extends ChangeNotifier {
 
   bool get isDarkMode {
     if (_themeMode == ThemeMode.system) {
-      return WidgetsBinding.instance.window.platformBrightness ==
+      return WidgetsBinding.instance.platformDispatcher.platformBrightness ==
           Brightness.dark;
     }
     return _themeMode == ThemeMode.dark;