chore: clear compiler warnings

Remove accidental dead code (unused imports, the superseded paste tool()
helper, a never-read TORIENT handles field, a duplicate let binding, an
unneeded mut) and mark intentional-but-unwired scaffolding with
allow(dead_code): the web-only save_to_bytes, the plugin loadable() probe,
the planned PICK_HIGHLIGHT colours, the DynFieldSpec label, and the layout
ribbon helpers. Native build is now warning-clean apart from the upstream
nom/quick-xml future-incompat notices.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

src/modules/draw/clipboard/paste.rs

@@ -1,6 +1,6 @@
 // Paste tool — ribbon definition + CadCommand implementation.
 
-use crate::modules::{IconKind, ModuleEvent, ToolDef};
+use crate::modules::IconKind;
 
 /// Shared icon for the Paste button and its dropdown entries.
 pub const ICON: IconKind = IconKind::Svg(include_bytes!("../../../../assets/icons/paste.svg"));
@@ -13,15 +13,6 @@ pub const MENU_ITEMS: &[(&str, &str, IconKind)] = &[
     ("PASTEBLOCK", "Paste as Block", ICON),
 ];
 
-pub fn tool() -> ToolDef {
-    ToolDef {
-        id: "PASTECLIP",
-        label: "Paste",
-        icon: ICON,
-        event: ModuleEvent::Command("PASTECLIP".to_string()),
-    }
-}
-
 // ── CadCommand implementation ─────────────────────────────────────────────
 
 use acadrust::Handle;

src/modules/draw/modify/torient.rs

@@ -9,7 +9,6 @@ use acadrust::Handle;
 use glam::Vec3;
 
 use crate::command::{CadCommand, CmdResult, DynField};
-use crate::modules::{IconKind, ModuleEvent, ToolDef};
 use crate::scene::model::wire_model::WireModel;
 use acadrust::EntityType;
 
@@ -21,16 +20,14 @@ enum Step {
 }
 
 pub struct TorientCommand {
-    handles: Vec<Handle>,
     entities: Vec<(Handle, EntityType)>,
     view_twist: f64,
     step: Step,
 }
 
 impl TorientCommand {
-    pub fn new(handles: Vec<Handle>, entities: Vec<(Handle, EntityType)>, view_twist: f64) -> Self {
+    pub fn new(entities: Vec<(Handle, EntityType)>, view_twist: f64) -> Self {
         Self {
-            handles,
             entities,
             view_twist,
             step: Step::AngleOrFirstPoint,