simulacion de estados y flujo de notificacion, modificacion de estilos en todas las vistas

recolecta_app/lib/features/home/main_shell.dart

@@ -1,18 +1,23 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../core/theme/app_theme.dart';
 import '../../core/widgets/app_widgets.dart';
+import '../notifications/notification_service.dart';
+import '../alerts/alerts_provider.dart';
 import 'citizen_home_screen.dart';
 import '../alerts/alerts_screen.dart';
 import 'house_screen.dart';
 import '../profile/profile_screen.dart';
 
-class MainShell extends StatefulWidget {
+class MainShell extends ConsumerStatefulWidget {
   const MainShell({super.key});
 
   @override
-  State<MainShell> createState() => _MainShellState();
+  ConsumerState<MainShell> createState() => _MainShellState();
 }
 
-class _MainShellState extends State<MainShell> {
+class _MainShellState extends ConsumerState<MainShell> {
   int _currentIndex = 0;
 
   static const List<Widget> _screens = [
@@ -22,6 +27,77 @@ class _MainShellState extends State<MainShell> {
     ProfileScreen(),
   ];
 
+  @override
+  void initState() {
+    super.initState();
+    NotificationService.onFcmMessage.addListener(_onGlobalPush);
+  }
+
+  @override
+  void dispose() {
+    NotificationService.onFcmMessage.removeListener(_onGlobalPush);
+    super.dispose();
+  }
+
+  void _onGlobalPush() {
+    final msg = NotificationService.onFcmMessage.lastMessage;
+    if (msg?.notification != null) {
+      final title = msg!.notification!.title ?? 'Nueva Alerta';
+      final body = msg.notification!.body ?? '';
+
+      ref.read(alertsProvider.notifier).addAlert(title, body);
+
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            backgroundColor: AppTheme.primaryDark,
+            behavior: SnackBarBehavior.floating,
+            margin: const EdgeInsets.all(16),
+            shape: RoundedRectangleBorder(
+              borderRadius: BorderRadius.circular(12),
+            ),
+            duration: const Duration(seconds: 5),
+            content: Column(
+              mainAxisSize: MainAxisSize.min,
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Row(
+                  children: [
+                    const Icon(
+                      Icons.notifications_active,
+                      color: Colors.white,
+                      size: 20,
+                    ),
+                    const SizedBox(width: 8),
+                    Expanded(
+                      child: Text(
+                        title,
+                        style: const TextStyle(
+                          fontWeight: FontWeight.bold,
+                          color: Colors.white,
+                        ),
+                      ),
+                    ),
+                  ],
+                ),
+                const SizedBox(height: 4),
+                Text(
+                  body,
+                  style: const TextStyle(color: Colors.white70, fontSize: 13),
+                ),
+              ],
+            ),
+            action: SnackBarAction(
+              label: 'VER',
+              textColor: AppTheme.primaryLight,
+              onPressed: () => setState(() => _currentIndex = 1),
+            ),
+          ),
+        );
+      }
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(