UI: borderless window with custom chrome, default 1280x720

Window
------
- Default size 1280x720 (16:9 widescreen — matches the screenshot framing
  the user requested), MinWidth=980 MinHeight=600.
- WindowStyle=None + ResizeMode=CanResize: drop the OS title bar but
  keep edge resize.
- WindowChrome: CaptionHeight=56 makes the top bar Border the
  drag-handle for moving the window. ResizeBorderThickness=6 gives
  6px of grab area on each edge, GlassFrameThickness=0 disables Aero.

Custom chrome buttons
---------------------
Three new style keys in Theme.xaml:
- WindowControlButton: 46x32 transparent button, hovers at #FFFFFF22
  (semi-translucent white) — used for minimize and maximize/restore.
- WindowCloseButton: same shape, hovers at #E81123 (Win11 red).

Three handlers wired up: OnMinimizeClick, OnMaxRestoreClick, OnCloseClick.

Caption click-through
---------------------
WindowChrome reserves the caption area for window dragging by default —
buttons inside it would otherwise feel "dead". Each interactive control
in the top bar (Vérifier les MAJ / Dossier / License pill / Activer /
Paramètres / min / max / close) gets
shell:WindowChrome.IsHitTestVisibleInChrome="True" so clicks reach the
button instead of starting a drag. The text/logo region remains
draggable.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/PSLauncher.App/Resources/Theme.xaml

@@ -135,6 +135,50 @@
         </Setter>
     </Style>
 
+    <!-- Boutons de chrome window (min / max / close), 46x40 façon Windows -->
+    <Style x:Key="WindowControlButton" TargetType="Button">
+        <Setter Property="Background" Value="Transparent" />
+        <Setter Property="Foreground" Value="{StaticResource Brush.Text.Primary}" />
+        <Setter Property="Cursor" Value="Hand" />
+        <Setter Property="Width" Value="46" />
+        <Setter Property="Height" Value="32" />
+        <Setter Property="Padding" Value="0" />
+        <Setter Property="BorderThickness" Value="0" />
+        <Setter Property="FontSize" Value="14" />
+        <Setter Property="FontFamily" Value="Segoe UI" />
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="Button">
+                    <Border x:Name="Bd" Background="{TemplateBinding Background}">
+                        <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
+                    </Border>
+                    <ControlTemplate.Triggers>
+                        <Trigger Property="IsMouseOver" Value="True">
+                            <Setter TargetName="Bd" Property="Background" Value="#FFFFFF22" />
+                        </Trigger>
+                    </ControlTemplate.Triggers>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+
+    <Style x:Key="WindowCloseButton" TargetType="Button" BasedOn="{StaticResource WindowControlButton}">
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="Button">
+                    <Border x:Name="Bd" Background="{TemplateBinding Background}">
+                        <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
+                    </Border>
+                    <ControlTemplate.Triggers>
+                        <Trigger Property="IsMouseOver" Value="True">
+                            <Setter TargetName="Bd" Property="Background" Value="#E81123" />
+                        </Trigger>
+                    </ControlTemplate.Triggers>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+
     <Style x:Key="IconButton" TargetType="Button">
         <Setter Property="Background" Value="Transparent" />
         <Setter Property="Foreground" Value="{StaticResource Brush.Text.Secondary}" />

src/PSLauncher.App/Views/MainWindow.xaml

@@ -2,16 +2,28 @@
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:vm="clr-namespace:PSLauncher.App.ViewModels"
+        xmlns:shell="clr-namespace:System.Windows.Shell;assembly=PresentationFramework"
         Title="PROSERVE Launcher"
         Background="Black"
-        Width="980" Height="780"
+        Width="1280" Height="720"
-        MinWidth="780" MinHeight="500"
+        MinWidth="980" MinHeight="600"
         WindowStartupLocation="CenterScreen"
+        WindowStyle="None"
+        ResizeMode="CanResize"
+        AllowsTransparency="False"
         d:DataContext="{d:DesignInstance Type=vm:MainViewModel}"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         mc:Ignorable="d"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006">
 
+    <shell:WindowChrome.WindowChrome>
+        <shell:WindowChrome CaptionHeight="56"
+                            GlassFrameThickness="0"
+                            CornerRadius="0"
+                            ResizeBorderThickness="6"
+                            UseAeroCaptionButtons="False" />
+    </shell:WindowChrome.WindowChrome>
+
     <Window.Resources>
 
         <!-- =================== TEMPLATE : LIGNE COMPACTE (autres versions) =================== -->
@@ -185,10 +197,12 @@
                     <Button Style="{StaticResource SecondaryButton}"
                             Content="🔄  Vérifier les MAJ"
                             Command="{Binding CheckForUpdatesCommand}"
+                            shell:WindowChrome.IsHitTestVisibleInChrome="True"
                             Margin="0,0,8,0" />
                     <Button Style="{StaticResource SecondaryButton}"
                             Content="📁  Dossier"
                             Command="{Binding OpenInstallRootCommand}"
+                            shell:WindowChrome.IsHitTestVisibleInChrome="True"
                             Margin="0,0,12,0" />
                     <!-- Badge license -->
                     <Border CornerRadius="14" Padding="10,4"
@@ -256,10 +270,27 @@
                     <Button Style="{StaticResource SecondaryButton}"
                             Content="🔑  Activer / changer"
                             Command="{Binding ActivateLicenseCommand}"
+                            shell:WindowChrome.IsHitTestVisibleInChrome="True"
                             Margin="0,0,8,0" />
                     <Button Style="{StaticResource SecondaryButton}"
                             Content="⚙  Paramètres"
-                            Command="{Binding OpenSettingsCommand}" />
+                            shell:WindowChrome.IsHitTestVisibleInChrome="True"
+                            Command="{Binding OpenSettingsCommand}"
+                            Margin="0,0,16,0" />
+
+                    <!-- Window controls custom (style chrome dark) -->
+                    <Button Style="{StaticResource WindowControlButton}"
+                            Content="—" ToolTip="Réduire"
+                            shell:WindowChrome.IsHitTestVisibleInChrome="True"
+                            Click="OnMinimizeClick" />
+                    <Button Style="{StaticResource WindowControlButton}"
+                            Content="☐" ToolTip="Agrandir / Restaurer"
+                            shell:WindowChrome.IsHitTestVisibleInChrome="True"
+                            Click="OnMaxRestoreClick" />
+                    <Button Style="{StaticResource WindowCloseButton}"
+                            Content="✕" ToolTip="Fermer"
+                            shell:WindowChrome.IsHitTestVisibleInChrome="True"
+                            Click="OnCloseClick" />
                 </StackPanel>
             </Grid>
         </Border>

src/PSLauncher.App/Views/MainWindow.xaml.cs

@@ -12,7 +12,7 @@ public partial class MainWindow : Window
     }
 
     /// <summary>
-    /// Le bouton "..." ouvre son ContextMenu sur clic gauche (par défaut, ContextMenu ne s'ouvre qu'au clic droit).
+    /// Le bouton "..." ouvre son ContextMenu sur clic gauche.
     /// </summary>
     private void OnMoreMenuClick(object sender, RoutedEventArgs e)
     {
@@ -23,4 +23,19 @@ public partial class MainWindow : Window
             menu.IsOpen = true;
         }
     }
+
+    private void OnMinimizeClick(object sender, RoutedEventArgs e)
+    {
+        WindowState = WindowState.Minimized;
+    }
+
+    private void OnMaxRestoreClick(object sender, RoutedEventArgs e)
+    {
+        WindowState = WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized;
+    }
+
+    private void OnCloseClick(object sender, RoutedEventArgs e)
+    {
+        Close();
+    }
 }