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>

Styles/FluentTheme.xaml

@@ -33,10 +33,9 @@
     <SolidColorBrush x:Key="WarningBrush" Color="{StaticResource WarningColor}"/>
     <SolidColorBrush x:Key="HeaderBarBrush" Color="{StaticResource HeaderBarColor}"/>
 
-    <!-- Global font -->
+    <!-- Global font — no Foreground here, it breaks inherited colors in buttons -->
     <Style TargetType="TextBlock">
         <Setter Property="FontFamily" Value="Segoe UI Variable Display, Segoe UI, Arial"/>
-        <Setter Property="Foreground" Value="{StaticResource TextPrimaryBrush}"/>
         <Setter Property="FontSize" Value="14"/>
     </Style>