fix(osnap): a POINT snaps as a Node only

A point carried a key vertex, so Endpoint (which outranks Node) claimed
it, and an absolute-size glyph's strokes were indexed for Nearest and
Intersection. Points now offer only their Node, in the indexed and the
unindexed snap paths alike.

Fixes #1570

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

src/scene/pick/interaction_index.rs

@@ -699,7 +699,7 @@ fn append_wire_index_entries(wire_idx: u32, wire: &WireModel, batch: &mut WireIn
         );
     }
 
-    if wire.point_marker.is_none() {
+    if wire.point_marker.is_none() && !wire.is_node_marker() {
         for start in 0..wire.points.len().saturating_sub(1) {
             let Some(aabb) = points_aabb3([
                 wire_point(wire, start),