feat(app): server selector, peer discovery, address view, menu bar, keep-alive

src/App/Views/MainWindow.axaml.cs

@@ -1,11 +1,35 @@
-using Avalonia.Controls;
-
-namespace PalladiumWallet.App.Views;
-
-public partial class MainWindow : Window
-{
-    public MainWindow()
-    {
-        InitializeComponent();
-    }
-}
+using System.Linq;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Platform.Storage;
+using PalladiumWallet.App.ViewModels;
+
+namespace PalladiumWallet.App.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+
+    /// <summary>File → Apri wallet da file (il picker richiede il TopLevel, da qui).</summary>
+    private async void OnOpenWalletFileClick(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is not MainWindowViewModel vm)
+            return;
+
+        var files = await StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions
+        {
+            Title = "Apri file wallet",
+            AllowMultiple = false,
+            FileTypeFilter =
+            [
+                new FilePickerFileType("Wallet Palladium") { Patterns = ["*.wallet.json", "*.json"] },
+            ],
+        });
+
+        if (files.FirstOrDefault()?.TryGetLocalPath() is { } path)
+            vm.OpenFromPath(path);
+    }
+}