Fix NotificationService platform

lib/main.dart

@@ -1,4 +1,4 @@
-import 'dart:io' show Platform;
+import 'package:flutter/foundation.dart' show TargetPlatform, defaultTargetPlatform, kIsWeb;
 import 'package:flutter/material.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:provider/provider.dart';
@@ -158,7 +158,7 @@ class _MeshCoreSarAppState extends State<MeshCoreSarApp> {
   /// Shows notification if update is available
   Future<void> _checkForUpdates() async {
     // Only check for updates on Android
-    if (!Platform.isAndroid) {
+    if (kIsWeb || defaultTargetPlatform != TargetPlatform.android) {
       debugPrint('[UpdateChecker] Skipping update check (not Android)');
       return;
     }
@@ -324,7 +324,7 @@ class _MeshCoreSarAppState extends State<MeshCoreSarApp> {
 
         // Wrap in SafeArea for Android only to fix navigation bar overlap (API ≥36)
         // iOS doesn't need SafeArea wrapping (causes extra black space at bottom)
-        if (Platform.isAndroid) {
+        if (!kIsWeb && defaultTargetPlatform == TargetPlatform.android) {
           return SafeArea(
             left: false,
             right: false,

lib/screens/settings_screen.dart

@@ -1,5 +1,5 @@
-import 'dart:io' show Platform;
 import 'dart:typed_data';
+import 'package:flutter/foundation.dart' show TargetPlatform, defaultTargetPlatform, kIsWeb;
 import 'package:flutter/material.dart';
 import 'package:flutter_avif/flutter_avif.dart';
 import 'package:image_picker/image_picker.dart';
@@ -470,7 +470,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
   /// Check for app updates and show notification or dialog
   Future<void> _checkForUpdates() async {
     // Only on Android
-    if (!Platform.isAndroid) {
+    if (kIsWeb || defaultTargetPlatform != TargetPlatform.android) {
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           const SnackBar(
@@ -1213,8 +1213,10 @@ class _SettingsScreenState extends State<SettingsScreen> {
             ),
           ]),
 
-          _buildSectionHeader('Network Sharing'),
-          const ConnectionModeSelector(),
+          if (!kIsWeb) ...[
+            _buildSectionHeader('Network Sharing'),
+            const ConnectionModeSelector(),
+          ],
 
           _buildSectionHeader(AppLocalizations.of(context)!.permissionsSection),
           _buildSettingsCard([
@@ -1320,7 +1322,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
               onTap: () => _showAboutDialog(),
             ),
           ]),
-          if (Platform.isAndroid)
+          if (!kIsWeb && defaultTargetPlatform == TargetPlatform.android)
             Padding(
               padding: const EdgeInsets.only(top: 8),
               child: FilledButton.icon(

lib/services/build_info_service.dart

@@ -1,6 +1,5 @@
-import 'dart:io' show Platform;
+import 'package:flutter/foundation.dart' show TargetPlatform, defaultTargetPlatform, debugPrint, kIsWeb;
 import 'package:flutter/services.dart';
-import 'package:flutter/foundation.dart';
 
 /// Service for accessing build information from native platform code
 /// Currently supports Android only - returns "unknown" for other platforms
@@ -25,7 +24,7 @@ class BuildInfoService {
     }
 
     // Only Android has the platform channel implementation
-    if (!Platform.isAndroid) {
+    if (kIsWeb || defaultTargetPlatform != TargetPlatform.android) {
       debugPrint('[BuildInfoService] Not on Android platform, returning "unknown"');
       _cachedCommitHash = 'unknown';
       return _cachedCommitHash!;

lib/widgets/connection_mode_selector.dart

@@ -1,4 +1,5 @@
 import 'dart:io';
+import 'package:flutter/foundation.dart' show kIsWeb;
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:provider/provider.dart';
@@ -25,6 +26,10 @@ class _ConnectionModeSelectorState extends State<ConnectionModeSelector> {
   }
 
   Future<void> _loadLocalIPs() async {
+    if (kIsWeb) {
+      return;
+    }
+
     final Set<String> ipsSet = {};
 
     try {