Improve layout and readability in Documents.razor

- Wrapped checkbox input in a div for better alignment.
- Changed documents initialization from an empty array to a list.
- Updated document addition code for improved readability.
- Modified ConfirmDialogOptions and ToastMessage initializations to use object initializer syntax.
- Translated comment in DocxContentDecoder.cs from Italian to English.

SqlDatabaseVectorSearch/Components/Pages/Documents.razor

@@ -76,7 +76,9 @@ else
             {
                 <tr>
                     <td>
+                        <div class="d-flex justify-content-center align-items-center">
                             <CheckboxInput @bind-Value="document.IsSelected" />
+                        </div>
                     </td>
                     <td>@document.Id</td>
                     <td>@document.Name</td>

SqlDatabaseVectorSearch/ContentDecoders/DocxContentDecoder.cs

@@ -36,7 +36,7 @@ public class DocxContentDecoder(IServiceProvider serviceProvider) : IContentDeco
             pageBuilder.AppendLine(paragraph.InnerText);
         }
 
-        // Dopo aver processato tutti i paragrafi, aggiungi l'ultima pagina (anche se vuota)
+        // After processing all paragraphs, add the last page (even if empty).
         pages.Add(pageBuilder.ToString());
 
         var chunks = new List<Chunk>();