feat(render): parse presentational attributes and font sizes for beautiful layout

crates/obscura-render/src/lib.rs

@@ -68,8 +68,8 @@ pub struct LayoutStyle {
     pub background_color: Option<[u8; 4]>,
     /// Foreground (text) color for the paint step.
     pub color: Option<[u8; 4]>,
-    /// Border color for the paint step.
     pub border_color: Option<[u8; 4]>,
+    pub font_size: Option<f32>,
 }
 
 /// A node in the input layout tree. `text` is carried for the paint phase; it