v1.16 — Remove PowerShell edition, restore flat project structure

PowerShell version removed — will use OV code signing certificate instead.
Files moved back from src/ to project root.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Pages/ConfirmDialog.xaml.cs

@@ -0,0 +1,75 @@
+using System;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+using System.Windows.Media;
+
+namespace InstaSoftOfficeTool.Pages
+{
+    public partial class ConfirmDialog : UserControl
+    {
+        private TaskCompletionSource<bool> _tcs;
+
+        public ConfirmDialog()
+        {
+            InitializeComponent();
+        }
+
+        public Task<bool> ShowAsync(string title, string message,
+            string confirmText = "Igen", string cancelText = "M\u00e9gse",
+            DialogType type = DialogType.Warning)
+        {
+            DialogTitle.Text = title;
+            DialogMessage.Text = message;
+            BtnConfirm.Content = confirmText;
+            BtnCancel.Content = cancelText;
+
+            switch (type)
+            {
+                case DialogType.Warning:
+                    DialogIcon.Text = "\uE7BA";
+                    DialogIcon.Foreground = (Brush)FindResource("WarningBrush");
+                    break;
+                case DialogType.Question:
+                    DialogIcon.Text = "\uE9CE";
+                    DialogIcon.Foreground = (Brush)FindResource("AccentBrush");
+                    break;
+                case DialogType.Error:
+                    DialogIcon.Text = "\uE711";
+                    DialogIcon.Foreground = (Brush)FindResource("ErrorBrush");
+                    break;
+            }
+
+            Visibility = Visibility.Visible;
+            _tcs = new TaskCompletionSource<bool>();
+            return _tcs.Task;
+        }
+
+        private void BtnConfirm_Click(object sender, RoutedEventArgs e)
+        {
+            Visibility = Visibility.Collapsed;
+            _tcs?.TrySetResult(true);
+        }
+
+        private void BtnCancel_Click(object sender, RoutedEventArgs e)
+        {
+            Visibility = Visibility.Collapsed;
+            _tcs?.TrySetResult(false);
+        }
+
+        private void Backdrop_MouseDown(object sender, MouseButtonEventArgs e)
+        {
+            // click outside = cancel
+            Visibility = Visibility.Collapsed;
+            _tcs?.TrySetResult(false);
+        }
+    }
+
+    public enum DialogType
+    {
+        Warning,
+        Question,
+        Error
+    }
+}