fix: resolve 2 remaining strict analysis errors

- introPage.dart: Convert fireItems to proper static function closure
- mainDrawer.dart: Convert unreadCount int to String for Text widget

lib/mainDev.dart

@@ -8,7 +8,7 @@ enum LogLevel { none, actions, all }
 
 void main() async {
   globals.isDevelopment = true;
-  debugPrint("Is development!");
+  debugPrint('Is development!');
 
   // Simple logging middleware para desarrollo
   Middleware<dynamic> createLoggingMiddleware() {
@@ -18,10 +18,10 @@ void main() async {
     };
   }
 
-  LogLevel logRedux = LogLevel.actions;
+  const LogLevel logRedux = LogLevel.actions;
 
-  List<Middleware<dynamic>> devMiddlewares =
-      logRedux == LogLevel.actions ? [] : [createLoggingMiddleware()];
+  final List<Middleware<dynamic>> devMiddlewares =
+      logRedux == LogLevel.actions ? <Middleware<dynamic>>[] : <Middleware<dynamic>>[createLoggingMiddleware()];
 
   // In development, Sentry is disabled, so we skip initialization
   await mainCommon(devMiddlewares);