check update

flutter_app/lib/screens/home_screen.dart

@@ -2,13 +2,30 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import '../providers/price_provider.dart';
+import '../providers/update_provider.dart';
 import '../widgets/price_chart.dart';
 import '../widgets/alerts_panel.dart';
 import '../widgets/vendor_table.dart';
+import '../widgets/update_notification.dart';
 
-class HomeScreen extends StatelessWidget {
+class HomeScreen extends StatefulWidget {
   const HomeScreen({super.key});
 
+  @override
+  State<HomeScreen> createState() => _HomeScreenState();
+}
+
+class _HomeScreenState extends State<HomeScreen> {
+  @override
+  void initState() {
+    super.initState();
+    // Initialize update provider
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      context.read<UpdateProvider>().initialize();
+      context.read<UpdateProvider>().startPeriodicChecks();
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -42,6 +59,33 @@ class HomeScreen extends StatelessWidget {
                     ),
                   ),
                   const SizedBox(width: 16),
+                  // Update check button
+                  Consumer<UpdateProvider>(
+                    builder: (context, updateProvider, child) {
+                      return IconButton(
+                        icon: updateProvider.isChecking
+                            ? const SizedBox(
+                                width: 12,
+                                height: 12,
+                                child: CircularProgressIndicator(
+                                  strokeWidth: 2,
+                                  color: Color(0xFF50E3C2),
+                                ),
+                              )
+                            : Icon(
+                                updateProvider.hasUpdate ? Icons.system_update : Icons.refresh,
+                                color: updateProvider.hasUpdate ? const Color(0xFF50E3C2) : Colors.white,
+                                size: 16,
+                              ),
+                        onPressed: updateProvider.isChecking
+                            ? null
+                            : () => updateProvider.checkForUpdates(force: true),
+                        tooltip: updateProvider.hasUpdate
+                            ? 'Update available'
+                            : 'Check for updates',
+                      );
+                    },
+                  ),
                   IconButton(
                     icon: const Icon(Icons.minimize, color: Colors.white, size: 16),
                     onPressed: () {
@@ -64,6 +108,8 @@ class HomeScreen extends StatelessWidget {
               child: Column(
                 crossAxisAlignment: CrossAxisAlignment.stretch,
                 children: [
+                  // Update notification banner
+                  const UpdateNotificationBanner(),
                   // Top stats row - Bloomberg style
                   Consumer<PriceProvider>(
                     builder: (context, provider, child) {