Fix arrow sizing and ensure navigation UI stays hidden

- Removed IconWidth/IconHeight from Forward button to match main branch
- Added Navigated event handler to forcefully hide navigation UI after each navigation
- This ensures the default Frame navigation bar never appears when navigating to Licenses page

The custom back/forward arrows should now be fully functional and the only visible navigation controls.

Author: cursoragent

src/Captura/Pages/SettingsPage.xaml

@@ -73,14 +73,12 @@
 
                         <mui:ModernButton IconData="{Binding Icons.Forward, Source={StaticResource ServiceLocator}}"
                                           IsEnabled="{Binding CanGoForward, ElementName=AboutFrame}"
-                                          EllipseDiameter="40"
-                                          IconWidth="35"
-                                          IconHeight="25"
                                           Click="AboutForwardButton_Click"/>
                     </DockPanel>
                     <Frame x:Name="AboutFrame"
                            Source="AboutPage.xaml"
-                           NavigationUIVisibility="Hidden"/>
+                           NavigationUIVisibility="Hidden"
+                           Navigated="AboutFrame_Navigated"/>
                 </DockPanel>
             </TabItem>
         </TabControl>

src/Captura/Pages/SettingsPage.xaml.cs

@@ -42,5 +42,14 @@ void AboutForwardButton_Click(object sender, RoutedEventArgs e)
                 AboutFrame.GoForward();
             }
         }
+
+        void AboutFrame_Navigated(object sender, NavigationEventArgs e)
+        {
+            // Ensure NavigationUI stays hidden after navigation
+            if (sender is System.Windows.Controls.Frame frame)
+            {
+                frame.NavigationUIVisibility = NavigationUIVisibility.Hidden;
+            }
+        }
     }
 }