fix(scene): bake selection colour into lod_stub_wire

The stub wires emitted at low LOD carried wire.selected = true but
stored the entity's own colour, so the actual on-screen pixel kept
the entity hue. Selecting an object and then zooming past the LOD
boundary made the highlight vanish even though the entity was still
in the selection set.

Swap to WireModel::SELECTED at construction time, matching what
tessellate.rs does for full-LOD wires.

Follow-up to #19.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

src/scene/mod.rs

@@ -5246,12 +5246,19 @@ fn lod_stub_wire(
     let [ax, ay, bx, by] = aabb;
     let cx = (ax + bx) * 0.5;
     let cy = (ay + by) * 0.5;
+    // Mirror what tessellate.rs does for the non-stub paths: bake the
+    // selection-highlight colour into the wire so a re-tessellate triggered
+    // by a zoom-induced LOD change keeps the entity highlighted. Without
+    // this swap the wire's `selected` flag is true but its colour stays at
+    // the entity's own hue, so the user sees the highlight vanish at the
+    // LOD boundary. #19.
+    let stored_color = if selected { WireModel::SELECTED } else { color };
     WireModel {
         name,
         // Diagonal: projects to 1-5 px at the LOD threshold so the entity
         // shows as a tiny mark.
         points: vec![[ax, ay, 0.0], [bx, by, 0.0]],
-        color,
+        color: stored_color,
         selected,
         aci,
         pattern_length: 0.0,