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>

Pages/TroubleshootPage.xaml.cs

@@ -194,11 +194,12 @@ namespace InstaSoftOfficeTool.Pages
             var btn = (Button)sender;
             var last5 = (string)btn.Tag;
 
-            var result = MessageBox.Show(
+            bool confirmed = await _main.ConfirmAsync(
+                "Kulcs elt\u00e1vol\u00edt\u00e1sa",
                 "Biztosan el szeretn\u00e9 t\u00e1vol\u00edtani a *****-" + last5 + " kulcsot?",
-                "Meger\u0151s\u00edt\u00e9s", MessageBoxButton.YesNo, MessageBoxImage.Question);
+                "Elt\u00e1vol\u00edt\u00e1s", "M\u00e9gse", DialogType.Question);
 
-            if (result != MessageBoxResult.Yes) return;
+            if (!confirmed) return;
 
             btn.IsEnabled = false;
             btn.Content = "...";
@@ -223,12 +224,13 @@ namespace InstaSoftOfficeTool.Pages
 
         private async void BtnRemoveAll_Click(object sender, RoutedEventArgs e)
         {
-            var result = MessageBox.Show(
+            bool confirmed = await _main.ConfirmAsync(
+                "\u00d6sszes kulcs elt\u00e1vol\u00edt\u00e1sa",
                 "Biztosan el szeretn\u00e9 t\u00e1vol\u00edtani az \u00f6sszes telep\u00edtett term\u00e9kkulcsot (" + _entries.Count + " db)?\n\n" +
                 "Ez nem t\u00f6r\u00f6l adatot, csak az aktiv\u00e1ci\u00f3s \u00e1llapotot \u00e1ll\u00edtja vissza.",
-                "Meger\u0151s\u00edt\u00e9s", MessageBoxButton.YesNo, MessageBoxImage.Warning);
+                "\u00d6sszes elt\u00e1vol\u00edt\u00e1sa", "M\u00e9gse");
 
-            if (result != MessageBoxResult.Yes) return;
+            if (!confirmed) return;
 
             BtnRemoveAll.IsEnabled = false;
             BtnRefresh.IsEnabled = false;