refactor(app): replace AddressInfoWindow with in-app overlay

The address detail panel is now rendered as a modal overlay inside
MainWindow instead of a separate top-level Window, avoiding the
create/destroy cost of a dialog and working better under WSLg.

Backdrop tap and Esc both close the overlay.

src/App/ViewModels/MainWindowViewModel.cs

@@ -249,6 +249,17 @@ public partial class MainWindowViewModel : ViewModelBase
     [ObservableProperty]
     private AddressRow? selectedAddressRow;
 
+    /// <summary>Dettaglio indirizzo mostrato nell'overlay in-app; null = nascosto.</summary>
+    [ObservableProperty]
+    private AddressInfo? addressInfo;
+
+    /// <summary>Apre l'overlay con i dati dell'indirizzo passato.</summary>
+    public void ShowAddressInfo(AddressRow row) =>
+        AddressInfo = new AddressInfo(Loc, row.Indirizzo, row.DerivPath, row.PubKey, row.PrivKey);
+
+    [RelayCommand]
+    private void CloseAddressInfo() => AddressInfo = null;
+
     // ---- rubrica contatti ----
 
     public ObservableCollection<ContactEntry> Contacts { get; } = [];

src/App/Views/AddressInfoWindow.axaml

@@ -1,49 +0,0 @@
-<Window xmlns="https://github.com/avaloniaui"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        xmlns:vm="using:PalladiumWallet.App.ViewModels"
-        x:Class="PalladiumWallet.App.Views.AddressInfoWindow"
-        x:DataType="vm:AddressInfo"
-        Title="{Binding Loc[addr.info.title]}"
-        Width="560" SizeToContent="Height"
-        CanResize="False"
-        WindowStartupLocation="CenterOwner">
-
-    <StackPanel Margin="24" Spacing="16">
-
-        <!-- Indirizzo -->
-        <StackPanel Spacing="4">
-            <TextBlock Text="{Binding Loc[addr.address]}" FontSize="11" Foreground="Gray"/>
-            <SelectableTextBlock Text="{Binding Address}"
-                                 FontFamily="monospace" FontSize="13"
-                                 TextWrapping="Wrap"/>
-        </StackPanel>
-
-        <!-- Derivation path -->
-        <StackPanel Spacing="4">
-            <TextBlock Text="{Binding Loc[addr.derivpath]}" FontSize="11" Foreground="Gray"/>
-            <SelectableTextBlock Text="{Binding DerivPath}"
-                                 FontFamily="monospace" FontSize="13"/>
-        </StackPanel>
-
-        <!-- Chiave pubblica -->
-        <StackPanel Spacing="4">
-            <TextBlock Text="{Binding Loc[addr.pubkey]}" FontSize="11" Foreground="Gray"/>
-            <SelectableTextBlock Text="{Binding PubKey}"
-                                 FontFamily="monospace" FontSize="12"
-                                 TextWrapping="Wrap"/>
-        </StackPanel>
-
-        <!-- Chiave privata (solo se disponibile) -->
-        <StackPanel Spacing="4" IsVisible="{Binding HasPrivKey}">
-            <TextBlock Text="{Binding Loc[addr.privkey]}" FontSize="11" Foreground="OrangeRed"/>
-            <SelectableTextBlock Text="{Binding PrivKey}"
-                                 FontFamily="monospace" FontSize="12"
-                                 Foreground="OrangeRed"
-                                 TextWrapping="Wrap"/>
-        </StackPanel>
-
-        <Button Content="{Binding Loc[addr.close]}"
-                HorizontalAlignment="Right"
-                Click="OnCloseClick"/>
-    </StackPanel>
-</Window>

src/App/Views/AddressInfoWindow.axaml.cs

@@ -1,20 +0,0 @@
-using Avalonia.Controls;
-using Avalonia.Interactivity;
-using PalladiumWallet.App.ViewModels;
-
-namespace PalladiumWallet.App.Views;
-
-public partial class AddressInfoWindow : Window
-{
-    public AddressInfoWindow()
-    {
-        InitializeComponent();
-    }
-
-    public AddressInfoWindow(AddressInfo info) : this()
-    {
-        DataContext = info;
-    }
-
-    private void OnCloseClick(object? sender, RoutedEventArgs e) => Close();
-}

src/App/Views/MainWindow.axaml

@@ -375,5 +375,60 @@
                 Padding="10,6">
             <TextBlock Text="{Binding StatusMessage}" FontSize="12" TextWrapping="Wrap"/>
         </Border>
+
+        <!-- ============ OVERLAY DETTAGLIO INDIRIZZO ============ -->
+        <!-- Overlay in-app invece di una Window separata: apertura/chiusura
+             istantanee (niente create/destroy di una top-level window). -->
+        <Border Grid.Row="0" Grid.RowSpan="3"
+                Background="#99000000"
+                Tapped="OnAddressOverlayBackdropTapped"
+                IsVisible="{Binding AddressInfo, Converter={x:Static ObjectConverters.IsNotNull}}">
+            <Border Background="{DynamicResource SystemControlBackgroundChromeMediumLowBrush}"
+                    BorderBrush="Gray" BorderThickness="1" CornerRadius="8"
+                    Width="560" Padding="0"
+                    HorizontalAlignment="Center" VerticalAlignment="Center"
+                    DataContext="{Binding AddressInfo}">
+                <StackPanel Margin="24" Spacing="16">
+                    <TextBlock Text="{Binding Loc[addr.info.title]}"
+                               FontSize="18" FontWeight="Bold"/>
+
+                    <!-- Indirizzo -->
+                    <StackPanel Spacing="4">
+                        <TextBlock Text="{Binding Loc[addr.address]}" FontSize="11" Foreground="Gray"/>
+                        <SelectableTextBlock Text="{Binding Address}"
+                                             FontFamily="monospace" FontSize="13"
+                                             TextWrapping="Wrap"/>
+                    </StackPanel>
+
+                    <!-- Derivation path -->
+                    <StackPanel Spacing="4">
+                        <TextBlock Text="{Binding Loc[addr.derivpath]}" FontSize="11" Foreground="Gray"/>
+                        <SelectableTextBlock Text="{Binding DerivPath}"
+                                             FontFamily="monospace" FontSize="13"/>
+                    </StackPanel>
+
+                    <!-- Chiave pubblica -->
+                    <StackPanel Spacing="4">
+                        <TextBlock Text="{Binding Loc[addr.pubkey]}" FontSize="11" Foreground="Gray"/>
+                        <SelectableTextBlock Text="{Binding PubKey}"
+                                             FontFamily="monospace" FontSize="12"
+                                             TextWrapping="Wrap"/>
+                    </StackPanel>
+
+                    <!-- Chiave privata (solo se disponibile) -->
+                    <StackPanel Spacing="4" IsVisible="{Binding HasPrivKey}">
+                        <TextBlock Text="{Binding Loc[addr.privkey]}" FontSize="11" Foreground="OrangeRed"/>
+                        <SelectableTextBlock Text="{Binding PrivKey}"
+                                             FontFamily="monospace" FontSize="12"
+                                             Foreground="OrangeRed"
+                                             TextWrapping="Wrap"/>
+                    </StackPanel>
+
+                    <Button Content="{Binding Loc[addr.close]}"
+                            HorizontalAlignment="Right"
+                            Command="{Binding $parent[Window].((vm:MainWindowViewModel)DataContext).CloseAddressInfoCommand}"/>
+                </StackPanel>
+            </Border>
+        </Border>
     </Grid>
 </Window>

src/App/Views/MainWindow.axaml.cs

@@ -37,15 +37,14 @@ public partial class MainWindow : Window
             vm.OpenFromPath(path);
     }
 
-    private async void OnAddressListTapped(object? sender, TappedEventArgs e)
+    private void OnAddressListTapped(object? sender, TappedEventArgs e)
     {
         if (DataContext is not MainWindowViewModel vm || vm.SelectedAddressRow is not { } row)
             return;
-        var info = new AddressInfo(vm.Loc, row.Indirizzo, row.DerivPath, row.PubKey, row.PrivKey);
+        vm.ShowAddressInfo(row);
-        await new AddressInfoWindow(info).ShowDialog(this);
     }
 
-    private async void OnAddressListPointerPressed(object? sender, PointerPressedEventArgs e)
+    private void OnAddressListPointerPressed(object? sender, PointerPressedEventArgs e)
     {
         if (!e.GetCurrentPoint(null).Properties.IsRightButtonPressed) return;
         if (sender is not ListBox lb || DataContext is not MainWindowViewModel vm) return;
@@ -54,8 +53,26 @@ public partial class MainWindow : Window
         if (item is not { DataContext: AddressRow row }) return;
 
         lb.SelectedItem = row;
+        vm.ShowAddressInfo(row);
+    }
 
-        var info = new AddressInfo(vm.Loc, row.Indirizzo, row.DerivPath, row.PubKey, row.PrivKey);
+    // Chiusura dell'overlay dettaglio indirizzo: click sullo sfondo scuro
-        await new AddressInfoWindow(info).ShowDialog(this);
+    // (solo sullo sfondo, non sulla scheda) o tasto Esc.
+    private void OnAddressOverlayBackdropTapped(object? sender, TappedEventArgs e)
+    {
+        if (!ReferenceEquals(e.Source, sender)) return;
+        if (DataContext is MainWindowViewModel vm)
+            vm.AddressInfo = null;
+    }
+
+    protected override void OnKeyDown(KeyEventArgs e)
+    {
+        if (e.Key == Key.Escape && DataContext is MainWindowViewModel { AddressInfo: not null } vm)
+        {
+            vm.AddressInfo = null;
+            e.Handled = true;
+            return;
+        }
+        base.OnKeyDown(e);
     }
 }