Add project files

Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+
+namespace NexvaneHub.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+
+    // The title bar has no native chrome anymore (ExtendClientAreaChromeHints
+    // = NoChrome), so dragging the window has to be done by hand. Buttons in
+    // the title bar (settings gear, minimize/maximize/close) consume their
+    // own PointerPressed before it reaches here, so this only fires for
+    // clicks on the blank part of the bar.
+    private void TitleBar_PointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            BeginMoveDrag(e);
+        }
+    }
+
+    private void MinimizeButton_Click(object? sender, RoutedEventArgs e)
+    {
+        WindowState = WindowState.Minimized;
+    }
+
+    private void MaximizeButton_Click(object? sender, RoutedEventArgs e)
+    {
+        WindowState = WindowState == WindowState.Maximized
+            ? WindowState.Normal
+            : WindowState.Maximized;
+    }
+
+    private void CloseButton_Click(object? sender, RoutedEventArgs e)
+    {
+        Close();
+    }
+}