Remove unused node_id_from_box_type_pub function

Co-Authored-By: Claude Opus 4.6 (1M context) <[e-mail]>

crates/render/src/lib.rs

···
     }
 }
 
-/// Public variant of `node_id_from_box_type` for use by other crates.
-pub fn node_id_from_box_type_pub(box_type: &BoxType) -> Option<NodeId> {
-    node_id_from_box_type(box_type)
-}
-
 fn paint_background(layout_box: &LayoutBox, list: &mut DisplayList, tx: f32, ty: f32) {
     let bg = layout_box.background_color;
     // Only paint if the background is not fully transparent and the box has area.