refactor: Centralize error and notification handling using a dedicated _errorService across various components.

lib/components/map/map_content.dart

@@ -5,6 +5,7 @@ import 'dart:convert';
 import 'package:http/http.dart' as http;
 import 'dart:ui' as ui;
 import 'package:flutter_dotenv/flutter_dotenv.dart';
+import '../../services/error_service.dart';
 
 class MapContent extends StatefulWidget {
   final String? initialSearchQuery;
@@ -416,13 +417,7 @@ class _MapContentState extends State<MapContent> {
 
   void _showError(String message) {
     if (mounted) {
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(
-          content: Text(message),
-          backgroundColor: Colors.red,
-          behavior: SnackBarBehavior.floating,
-        ),
-      );
+      ErrorService().showError(message: message);
     }
   }