Show news on application load.

Marechai.App/Presentation/MainPage.xaml.cs

@@ -1,11 +1,60 @@
-using Microsoft.UI.Xaml.Controls;
+using System;
+using Windows.Foundation;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Navigation;
 
 namespace Marechai.App.Presentation;
 
 public sealed partial class MainPage : Page
 {
+    private bool _initialNewsLoaded;
+
     public MainPage()
     {
-        this.InitializeComponent();
+        InitializeComponent();
+        DataContextChanged += MainPage_DataContextChanged;
     }
-}
+
+    private void MainPage_DataContextChanged(FrameworkElement sender, DataContextChangedEventArgs args)
+    {
+        if(_initialNewsLoaded) return;
+
+        if(args.NewValue is MainViewModel viewModel && viewModel.NewsViewModel is not null)
+        {
+            _initialNewsLoaded =  true;
+            _                  =  viewModel.NewsViewModel.LoadNews.ExecuteAsync(null);
+            DataContextChanged -= MainPage_DataContextChanged;
+        }
+    }
+
+    protected override void OnNavigatedTo(NavigationEventArgs e)
+    {
+        base.OnNavigatedTo(e);
+
+        if(_initialNewsLoaded) return;
+
+        if(DataContext is MainViewModel viewModel && viewModel.NewsViewModel is not null)
+        {
+            _initialNewsLoaded =  true;
+            _                  =  viewModel.NewsViewModel.LoadNews.ExecuteAsync(null);
+            DataContextChanged -= MainPage_DataContextChanged;
+        }
+    }
+
+    private async void RefreshContainer_RefreshRequested(RefreshContainer sender, RefreshRequestedEventArgs args)
+    {
+        // Handle pull-to-refresh
+        using Deferral deferral = args.GetDeferral();
+
+        try
+        {
+            if(DataContext is MainViewModel viewModel && viewModel.NewsViewModel is not null)
+                await viewModel.NewsViewModel.LoadNews.ExecuteAsync(null);
+        }
+        catch(Exception)
+        {
+            // Swallow to avoid process crash; NewsViewModel already logs errors.
+        }
+    }
+}