chore: fix all compiler warnings

- cmd_result.rs: remove unused Point3 and Rad imports (SWEEP block)
- scene/mod.rs: remove unused Solid3D struct import
- commands.rs: drop unnecessary `mut` on new_entities (REFCLOSE block)
- refedit.rs: annotate insert_handle with #[allow(dead_code)]

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/cmd_result.rs

@@ -1002,7 +1002,7 @@ impl H7CAD {
                 use crate::scene::truck_tess;
                 use crate::modules::insert::solid3d_cmds::empty_solid3d;
                 use truck_modeling::builder;
-                use truck_modeling::{Point3, Rad, Vector3 as TruckVec3};
+                use truck_modeling::Vector3 as TruckVec3;
 
                 let profile_ent = self.tabs[i].scene.document.get_entity(profile_handle).cloned();
                 let path_ent    = self.tabs[i].scene.document.get_entity(path_handle).cloned();

src/app/commands.rs

@@ -1624,7 +1624,7 @@ impl H7CAD {
                 self.push_undo_snapshot(i, "REFCLOSE");
 
                 // Collect the edited temp entities.
-                let mut new_entities: Vec<acadrust::EntityType> = session.temp_handles
+                let new_entities: Vec<acadrust::EntityType> = session.temp_handles
                     .iter()
                     .filter_map(|h| self.tabs[i].scene.document.get_entity(*h).cloned())
                     .collect();

src/modules/home/modify/refedit.rs

@@ -23,7 +23,8 @@ use crate::command::{CadCommand, CmdResult};
 /// Active REFEDIT session.  Lives in `DocumentTab::refedit_session`.
 #[derive(Debug, Clone)]
 pub struct RefEditSession {
-    /// The INSERT entity being edited.
+    /// The INSERT entity being edited (kept for future REFCLOSE DISCARD).
+    #[allow(dead_code)]
     pub insert_handle: Handle,
     /// Name of the block being edited.
     pub block_name: String,

src/scene/mod.rs

@@ -35,7 +35,7 @@ pub use wire_model::WireModel;
 
 use crate::command::EntityTransform;
 use acadrust::entities::{BoundaryEdge, BoundaryPath, Hatch as DxfHatch, PolylineEdge, Solid as DxfSolid};
-use acadrust::entities::{Block, BlockEnd, Insert as DxfInsert, Solid3D};
+use acadrust::entities::{Block, BlockEnd, Insert as DxfInsert};
 use acadrust::objects::ObjectType;
 use acadrust::types::Vector2;
 use acadrust::{CadDocument, EntityType, Handle, TableEntry};