v1.05 — Fix primary button text contrast (white on blue)

- Removed Foreground from global TextBlock style (was overriding inherited colors)
- Set TextElement.Foreground on Window level for default text color
- PrimaryButton TextElement.Foreground now properly inherits white

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

MainWindow.xaml

@@ -5,7 +5,8 @@
         Width="800" Height="550"
         ResizeMode="NoResize"
         WindowStartupLocation="CenterScreen"
-        Background="{StaticResource BackgroundBrush}">
+        Background="{StaticResource BackgroundBrush}"
+        TextElement.Foreground="{StaticResource TextPrimaryBrush}">
 
     <Grid>
         <Grid.RowDefinitions>
@@ -41,7 +42,7 @@
                                    Foreground="{StaticResource TextSecondaryBrush}" Margin="0,-2,0,0"/>
                     </StackPanel>
                 </StackPanel>
-                <TextBlock Text="v1.04" HorizontalAlignment="Right" VerticalAlignment="Center"
+                <TextBlock Text="v1.05" HorizontalAlignment="Right" VerticalAlignment="Center"
                            FontSize="12" Foreground="{StaticResource TextSecondaryBrush}"/>
             </Grid>
         </Border>