Fix extruded solid grip preview and taper range

src/scene/mod.rs

@@ -1476,6 +1476,9 @@ pub struct Scene {
     pub selection_filter: HashSet<String>,
     /// In-progress preview wires while a command is active (rubber-band + object ghosts).
     pub preview_wires: Vec<WireModel>,
+    /// Candidate wireframes produced by editable solid-history grips. The
+    /// resident body remains untouched until the grip is committed.
+    solid_history_preview_wires: HashMap<Handle, Vec<WireModel>>,
     /// Live hatch fill used by interactive edits such as dragging the pattern
     /// origin grip. Kept separate from the resident hatch set so moving one
     /// pattern never re-uploads every hatch in a large drawing.
@@ -1883,6 +1886,7 @@ impl Scene {
             model_lineweight_scale: 1.0,
             selection_filter: HashSet::default(),
             preview_wires: vec![],
+            solid_history_preview_wires: HashMap::default(),
             preview_hatches: Arc::new(Vec::new()),
             preview_text: vec![],
             interim_wire: None,