feat(solid history): Ctrl+click picks a composite's solid; show history draws them

Ctrl+click on a composite selects it with the solid under the cursor as
the one its palette and grips edit: the solid whose own surface passes
through the picked point. With its history shown, a composite draws the
edges of the solids its booleans joined, each where it sits.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/scene/pick/hit_test.rs

@@ -904,6 +904,17 @@ pub(crate) fn mesh_click_point<'a>(
     mesh_click_result(cursor, meshes, view_rot, eye, bounds).map(|(_, _, point)| point)
 }
 
+/// The nearest mesh under the cursor and where the pick ray meets it.
+pub(crate) fn mesh_click_handle_point<'a>(
+    cursor: Point,
+    meshes: impl Iterator<Item = MeshPickItem<'a>>,
+    view_rot: Mat4,
+    eye: glam::DVec3,
+    bounds: Rectangle,
+) -> Option<(Handle, glam::DVec3)> {
+    mesh_click_result(cursor, meshes, view_rot, eye, bounds).map(|(_, handle, point)| (handle, point))
+}
+
 fn mesh_click_result<'a>(
     cursor: Point,
     meshes: impl Iterator<Item = MeshPickItem<'a>>,