Enhance ConfirmDialog with customizable button styles and add PDF opening functionality in AccountDetail

src/Duempelkas.Infrastructure/Services/FileSaveService.cs

@@ -15,6 +15,36 @@ public class FileSaveService : IFileSaveService
         return filePath;
     }
 
+    public Task OpenFileAsync(string filePath)
+    {
+        if (string.IsNullOrWhiteSpace(filePath) || !File.Exists(filePath))
+        {
+            return Task.CompletedTask;
+        }
+
+        return Task.Run(() =>
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                Process.Start(new ProcessStartInfo
+                {
+                    FileName = filePath,
+                    UseShellExecute = true
+                });
+
+                return;
+            }
+
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
+            {
+                Process.Start("open", filePath);
+                return;
+            }
+
+            Process.Start("xdg-open", filePath);
+        });
+    }
+
     private static Task<string?> ShowSaveDialogAsync(string suggestedFileName)
     {
         return Task.Run(() =>