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

src/Duempelkas.App/Pages/Accounts/AccountDetail.razor

@@ -144,6 +144,18 @@
                    OnCancel="CancelRestoreConfirm" />
 }
 
+@if (!string.IsNullOrWhiteSpace(savedPdfPath))
+{
+    <ConfirmDialog Title="PDF öffnen"
+                   Message="Die PDF wurde gespeichert. Möchten Sie sie jetzt öffnen?"
+                   ConfirmText="Ja, öffnen"
+                   CancelText="Nein"
+                   ConfirmButtonClass="btn btn-primary"
+                   ConfirmIconClass="bi bi-box-arrow-up-right"
+                   OnConfirm="HandleOpenSavedPdf"
+                   OnCancel="CancelOpenSavedPdf" />
+}
+
 @if (editingEntry != null)
 {
     <AddEntryDialog AccountId="AccountId"
@@ -176,6 +188,8 @@
     private int? confirmRestoreEntryId;
     private string? confirmRestoreEntryTitle;
 
+    private string? savedPdfPath;
+
     private EntryDto? editingEntry;
     private EntryDto? editingTransferEntry;
 
@@ -291,7 +305,22 @@
     {
         var pdf = await PdfStatementService.GenerateStatementAsync(AccountId, showCurrentYearOnly);
         var suffix = showCurrentYearOnly ? $"_{DateTime.Now.Year}" : "_Gesamt";
-        await FileSaveService.SaveFileAsync(pdf, $"{account?.Name}{suffix}.pdf");
+        savedPdfPath = await FileSaveService.SaveFileAsync(pdf, $"{account?.Name}{suffix}.pdf");
+    }
+
+    private async Task HandleOpenSavedPdf()
+    {
+        if (!string.IsNullOrWhiteSpace(savedPdfPath))
+        {
+            await FileSaveService.OpenFileAsync(savedPdfPath);
+        }
+
+        savedPdfPath = null;
+    }
+
+    private void CancelOpenSavedPdf()
+    {
+        savedPdfPath = null;
     }
 
     private static string FormatAmount(decimal amount) => $"{amount:N2} €";