fix: apply world_offset when committing interactively created entities

Commands receive click coordinates in local space (DXF coords minus
world_offset) for camera precision. Without correction, entities were
placed world_offset away from the clicked position in existing drawings
that have a non-zero centroid (e.g. UTM-coordinate drawings).

Re-add world_offset via acadrust::Transform::from_translation (f64
precision) in commit_entity before the entity is inserted into the
DXF document. Paper-space entities are exempt as they use sheet coords.

Fixes #11

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

src/app/properties.rs

@@ -295,6 +295,19 @@ impl H7CAD {
         );
         crate::scene::dispatch::apply_line_weight(&mut entity, self.ribbon.active_lineweight);
 
+        // Commands pick points in local space (camera coordinates with world_offset
+        // already subtracted). Re-add world_offset so the entity lands at the correct
+        // DXF coordinate. Skip for paper-space entities (they use sheet mm coords).
+        let is_paper = self.tabs[i].scene.current_layout != "Model";
+        if !is_paper {
+            let wo = self.tabs[i].scene.world_offset;
+            if wo[0] != 0.0 || wo[1] != 0.0 || wo[2] != 0.0 {
+                let delta = acadrust::types::Vector3::new(wo[0], wo[1], wo[2]);
+                let t = acadrust::types::Transform::from_translation(delta);
+                entity.apply_transform(&t);
+            }
+        }
+
         if matches!(&entity, acadrust::EntityType::Viewport(_))
             && self.tabs[i].scene.current_layout != "Model"
         {