v1.08 — Custom Fluent confirmation dialog, replace all MessageBox

- New ConfirmDialog overlay with dark backdrop, rounded card, shadow
- Warning/Question/Error icon types with accent colors
- Replaced all MessageBox.Show calls (RemovePage, PreInstallCheck, Troubleshoot)
- Click outside dialog = cancel

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

MainWindow.xaml.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Media;
@@ -194,6 +195,13 @@ namespace InstaSoftOfficeTool
             BtnNext.Click += (s, e) => Close();
         }
 
+        public Task<bool> ConfirmAsync(string title, string message,
+            string confirmText = "Igen", string cancelText = "M\u00e9gse",
+            DialogType type = DialogType.Warning)
+        {
+            return Dialog.ShowAsync(title, message, confirmText, cancelText, type);
+        }
+
         public void ShowBackToHomeButton()
         {
             BtnBack.Content = "\u2190 F\u0151oldal";