v1.04 — Config layout, button contrast, Skype default, Win11 for 2019

- Arch + Language side by side on config page
- Removed redundant hint text under app checkboxes
- Primary button: white text on blue (TextElement.Foreground fix)
- Skype for Business unchecked by default
- Office 2019: added Windows 11 support, end-of-support note
- Version display synced to v1.04

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Styles/ButtonStyles.xaml

@@ -18,7 +18,8 @@
                             Background="{TemplateBinding Background}"
                             CornerRadius="4"
                             Padding="{TemplateBinding Padding}"
-                            SnapsToDevicePixels="True">
+                            SnapsToDevicePixels="True"
+                            TextElement.Foreground="{StaticResource TextOnAccentBrush}">
                         <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                     </Border>
                     <ControlTemplate.Triggers>