edit

BookReader/ViewModels/ReaderViewModel.cs

@@ -121,6 +121,9 @@ public partial class ReaderViewModel : BaseViewModel
     {
         if (Book == null) return;
 
+        // Важно: если CFI пустой, не перезаписываем старый прогресс (защита от багов JS)
+        if (string.IsNullOrEmpty(cfi) && progress <= 0) return;
+
         Book.ReadingProgress = progress;
         Book.LastCfi = cfi;
         Book.LastChapter = chapter;
@@ -128,6 +131,7 @@ public partial class ReaderViewModel : BaseViewModel
         Book.TotalPages = totalPages;
         Book.LastRead = DateTime.UtcNow;
 
+        // Сохраняем в базу данных
         await _databaseService.UpdateBookAsync(Book);
 
         await _databaseService.SaveProgressAsync(new ReadingProgress

BookReader/Views/ReaderPage.xaml

@@ -3,6 +3,7 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              xmlns:vm="clr-namespace:BookReader.ViewModels"
              xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
+             xmlns:converters="clr-namespace:BookReader.Converters"
              x:Class="BookReader.Views.ReaderPage"
              x:DataType="vm:ReaderViewModel"
              Shell.NavBarIsVisible="False"

BookReader/Views/ReaderPage.xaml.cs

@@ -18,6 +18,10 @@ public partial class ReaderPage : ContentPage
         _viewModel = viewModel;
         BindingContext = viewModel;
         _viewModel.OnJavaScriptRequested += OnJavaScriptRequested;
+        //Microsoft.Maui.Controls.Application.Current.Deactivated += async (s, e) =>
+        //{
+        //    if (_isActive) await SaveCurrentProgress();
+        //};
     }
 
     protected override async void OnAppearing()
@@ -44,7 +48,13 @@ public partial class ReaderPage : ContentPage
         await SaveCurrentProgress();
     }
 
-   
+    protected override async void OnNavigatedFrom(NavigatedFromEventArgs args)
+    {
+        _isActive = false;
+        base.OnNavigatedFrom(args);
+        // Сохраняем немедленно при любом уходе со страницы
+        await SaveCurrentProgress();
+    }
 
     // ========== ЗАГРУЗКА КНИГИ ==========