feat(app): add demo mode optimizations

- Add environment check to skip periodic app status checks in demo mode
- Implement conditional app lifecycle checks based on environment
- Update AppStatusService constructor to include AppEnvironment parameter
- Modify _AppViewState to pass environment to AppStatusService

These changes improve the demo experience by reducing unnecessary reloads
and optimizing resource usage when running in demo mode.

Author: fulleni

lib/app/services/app_status_service.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:flutter_news_app_mobile_client_full_source_code/app/config/config.dart';
 import 'package:flutter_news_app_mobile_client_full_source_code/app/bloc/app_bloc.dart';
 
 /// {@template app_status_service}
@@ -28,8 +29,10 @@ class AppStatusService with WidgetsBindingObserver {
   AppStatusService({
     required BuildContext context,
     required Duration checkInterval,
+    required AppEnvironment environment,
   })  : _context = context,
-        _checkInterval = checkInterval {
+        _checkInterval = checkInterval,
+        _environment = environment {
     // Immediately register this service as a lifecycle observer.
     WidgetsBinding.instance.addObserver(this);
     // Start the periodic checks.
@@ -42,6 +45,9 @@ class AppStatusService with WidgetsBindingObserver {
   /// The interval at which to perform periodic status checks.
   final Duration _checkInterval;
 
+  /// The current application environment.
+  final AppEnvironment _environment;
+
   /// The timer responsible for periodic checks.
   Timer? _timer;
 
@@ -54,6 +60,13 @@ class AppStatusService with WidgetsBindingObserver {
     _timer?.cancel();
     // Create a new periodic timer.
     _timer = Timer.periodic(_checkInterval, (_) {
+      // In demo mode, periodic checks are not needed as there's no backend.
+      if (_environment == AppEnvironment.demo) {
+        print(
+          '[AppStatusService] Demo mode: Skipping periodic check.',
+        );
+        return;
+      }
       print(
         '[AppStatusService] Periodic check triggered. Requesting AppConfig fetch.',
       );
@@ -67,6 +80,14 @@ class AppStatusService with WidgetsBindingObserver {
   /// This method is called whenever the application's lifecycle state changes.
   @override
   void didChangeAppLifecycleState(AppLifecycleState state) {
+    // In demo mode, we disable the app resume check. This is especially
+    // useful on web, where switching browser tabs would otherwise trigger
+    // a reload, which is unnecessary and can be distracting for demos.
+    if (_environment == AppEnvironment.demo) {
+      print('[AppStatusService] Demo mode: Skipping app lifecycle check.');
+      return;
+    }
+
     // We are only interested in the 'resumed' state.
     if (state == AppLifecycleState.resumed) {
       print(

lib/app/view/app.dart

@@ -152,6 +152,7 @@ class _AppViewState extends State<_AppView> {
     _appStatusService = AppStatusService(
       context: context,
       checkInterval: const Duration(minutes: 15),
+      environment: widget.environment,
     );
 
     _router = createRouter(