Select: Bristle Brush Strokes selects objects by their brush's type

Select > Object > Bristle Brush Strokes selected the objects whose
brush name contains "bristle". It missed objects with a bristle brush
of any other name, and it selected objects whose brush is of another
type with "Bristle" in its name.

select.object.bristleBrushStrokes now looks up the brush of each
object's topmost stroke in the document's brush library and selects the
object when the brush is a bristle brush, whatever its name.

Docs: docs/mcp.md, docs/target-app-parity.md.

crates/engine/src/cmd/docmenu.rs

@@ -83,13 +83,18 @@ pub fn specs() -> Vec<CommandSpec> {
             "Bristle Brush Strokes",
             ["Select", "Object"],
             None,
-            "{} objects whose brush name contains \"bristle\" → {count}",
+            "{} objects whose topmost stroke has a bristle brush (type bristle in brush.list), whatever the brush is named → {count}",
             has_doc,
-            |s, _| by_kind(s, |n| n
-                .appearance
-                .stroke()
-                .and_then(|st| st.brush.as_deref())
-                .is_some_and(|b| b.to_ascii_lowercase().contains("bristle")))
+            |s, _| {
+                let brushes = vectorcraft_brush::library(&s.doc()?.doc);
+                by_kind(s, |n| {
+                    n.appearance
+                        .stroke()
+                        .and_then(|st| st.brush.as_deref())
+                        .and_then(|name| brushes.iter().find(|b| b.name == name))
+                        .is_some_and(|b| matches!(b.kind, vectorcraft_brush::BrushKind::Bristle(_)))
+                })
+            }
         ),
         cmd!(
             "select.save",
@@ -305,7 +310,7 @@ fn same_text(s: &mut Session, cmd: &str, eq: fn(&CharStyle, &CharStyle) -> bool)
     finish_same(s, cmd, ids)
 }
 
-fn by_kind(s: &mut Session, f: fn(&Node) -> bool) -> Result<Value> {
+fn by_kind(s: &mut Session, f: impl Fn(&Node) -> bool) -> Result<Value> {
     let ids = candidates(s, f)?;
     let n = ids.len();
     s.select(|_, sel| sel.set(ids))?;