refactor(modules): rename home module to draw, restore first-tab order

The Home tab was already titled "Draw"; rename the module to match:
folder modules/home → modules/draw, HomeModule → DrawModule, id "home"
→ "draw". The inner draw/ command folder is kept (modules::draw::draw).

Update build.rs PRIORITY ("home" → "draw") so the tab returns to the
front of the ribbon; registry.rs regenerates accordingly.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/modules/draw/modify/copy.rs

@@ -0,0 +1,108 @@
+// Copy tool — ribbon definition + interactive command.
+//
+// Command:  COPY (CO)
+//   Requires at least one entity selected before starting.
+//   Step 1: pick base point
+//   Step 2+: each click makes another copy at (click - base); Enter to finish.
+
+use acadrust::Handle;
+use glam::Vec3;
+
+use crate::command::{CadCommand, CmdResult, EntityTransform};
+use crate::modules::{IconKind, ModuleEvent, ToolDef};
+use crate::scene::model::wire_model::WireModel;
+
+// ── Ribbon definition ──────────────────────────────────────────────────────
+
+pub fn tool() -> ToolDef {
+    ToolDef {
+        id: "COPY",
+        label: "Copy",
+        icon: IconKind::Svg(include_bytes!("../../../../assets/icons/copy.svg")),
+        event: ModuleEvent::Command("COPY".to_string()),
+    }
+}
+
+// ── Command implementation ─────────────────────────────────────────────────
+
+enum Step {
+    Base,
+    Placing(Vec3),
+}
+
+pub struct CopyCommand {
+    handles: Vec<Handle>,
+    wire_models: Vec<WireModel>,
+    step: Step,
+    count: usize,
+}
+
+impl CopyCommand {
+    pub fn new(handles: Vec<Handle>, wire_models: Vec<WireModel>) -> Self {
+        Self {
+            handles,
+            wire_models,
+            step: Step::Base,
+            count: 0,
+        }
+    }
+}
+
+impl CadCommand for CopyCommand {
+    fn name(&self) -> &'static str {
+        "COPY"
+    }
+
+    fn prompt(&self) -> String {
+        match &self.step {
+            Step::Base => format!(
+                "COPY  Specify base point  [{} objects]:",
+                self.handles.len()
+            ),
+            Step::Placing(base) => format!(
+                "COPY  Specify destination  [{} copies so far | Enter=done | base {:.3},{:.3}]:",
+                self.count, base.x, base.y
+            ),
+        }
+    }
+
+    fn on_point(&mut self, pt: Vec3) -> CmdResult {
+        match &self.step {
+            Step::Base => {
+                self.step = Step::Placing(pt);
+                CmdResult::NeedPoint
+            }
+            Step::Placing(base) => {
+                let delta = pt - *base;
+                self.count += 1;
+                CmdResult::CopySelected(self.handles.clone(), EntityTransform::Translate(delta))
+            }
+        }
+    }
+
+    fn on_enter(&mut self) -> CmdResult {
+        CmdResult::Cancel
+    }
+    fn on_escape(&mut self) -> CmdResult {
+        CmdResult::Cancel
+    }
+
+    fn on_preview_wires(&mut self, pt: Vec3) -> Vec<WireModel> {
+        let Step::Placing(base) = &self.step else {
+            return vec![];
+        };
+        let delta = pt - *base;
+        let mut out: Vec<WireModel> = self
+            .wire_models
+            .iter()
+            .map(|w| w.translated(delta))
+            .collect();
+        out.push(WireModel::solid(
+            "rubber_band".into(),
+            vec![[base.x, base.y, base.z], [pt.x, pt.y, pt.z]],
+            WireModel::CYAN,
+            false,
+        ));
+        out
+    }
+}