wordmark_ink: an SVG wordmark drawn in the page's own ink, following light and dark everywhere

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GT37Z1Xtfd9pUuQtMTg6Yt

src/content/mod.rs

@@ -767,6 +767,14 @@ pub struct SiteConfig {
     /// intrinsic pixel height.
     #[serde(default)]
     pub wordmark_height: Option<f32>,
+    /// Draw an SVG wordmark in the page's own ink instead of its own
+    /// colours: the file becomes a mask over the text colour, so it
+    /// follows the page's light and dark (and any theme a site adds),
+    /// where an `<img>` only ever knows the system's. Opacity in the
+    /// file still shows, so a lighter line stays lighter. For a
+    /// one-colour mark; a mark with a colour of its own keeps `false`.
+    #[serde(default)]
+    pub wordmark_ink: bool,
     /// BCP 47-ish language code for the portal's own chrome strings
     /// ("Asked by", the nav lead...) and the html lang attribute.
     /// `None` means "en"; unknown codes fall back to English per key.