♻️ Adjust the firebase analytics observer guard

🐛 linux: guard FirebaseAnalyticsObserver when Firebase is not initialized

lib/route.dart

@@ -1,6 +1,8 @@
+import 'dart:io' show Platform;
 import 'package:animations/animations.dart';
 import 'package:firebase_analytics/firebase_analytics.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/foundation.dart' show kIsWeb;
 import 'package:go_router/go_router.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:island/screens/about.dart';
@@ -70,13 +72,21 @@ Widget _tabPagesTransitionBuilder(
   );
 }
 
+bool get _supportsAnalytics =>
+    kIsWeb ||
+    Platform.isAndroid ||
+    Platform.isIOS ||
+    Platform.isMacOS ||
+    Platform.isWindows;
+
 // Provider for the router
 final routerProvider = Provider<GoRouter>((ref) {
   return GoRouter(
     navigatorKey: rootNavigatorKey,
     initialLocation: '/',
     observers: [
-      FirebaseAnalyticsObserver(analytics: FirebaseAnalytics.instance),
+      if (_supportsAnalytics)
+        FirebaseAnalyticsObserver(analytics: FirebaseAnalytics.instance),
     ],
     routes: [
       ShellRoute(