feat: BOX, SPHERE, CYLINDER primitives + EXTRUDE / REVOLVE commands

BOX, SPHERE, and CYLINDER build truck topology solids and tessellate
them into MeshModels stored alongside a Solid3D placeholder entity so
the GPU mesh pipeline renders them immediately.

EXTRUDE picks any closed 2D profile (Circle, LwPolyline, etc.),
attaches a planar face via try_attach_plane, and translational-sweeps
it (tsweep Face → Solid) along Z by the given height.

REVOLVE picks a profile, two axis points, and an angle (default 360°),
then rotational-sweeps the wire (rsweep) around the axis.

Three new CmdResult variants drive the operations:
  CommitSolid3D, ExtrudeEntity, RevolveEntity.

Scene::layer_color() added to retrieve the active layer's RGBA color.

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

src/app/commands.rs

@@ -3402,6 +3402,61 @@ impl H7CAD {
                 }
             }
 
+            // ── 3D Primitive — BOX ────────────────────────────────────────
+            "BOX" => {
+                use crate::modules::insert::solid3d_cmds::BoxCommand;
+                let color = self.tabs[i].scene.layer_color(&self.tabs[i].active_layer);
+                let cmd = BoxCommand::new(color);
+                self.command_line.push_info(&cmd.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(cmd));
+            }
+
+            // ── 3D Primitive — SPHERE ─────────────────────────────────────
+            "SPHERE" => {
+                use crate::modules::insert::solid3d_cmds::SphereCommand;
+                let color = self.tabs[i].scene.layer_color(&self.tabs[i].active_layer);
+                let cmd = SphereCommand::new(color);
+                self.command_line.push_info(&cmd.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(cmd));
+            }
+
+            // ── 3D Primitive — CYLINDER ───────────────────────────────────
+            "CYLINDER" => {
+                use crate::modules::insert::solid3d_cmds::CylinderCommand;
+                let color = self.tabs[i].scene.layer_color(&self.tabs[i].active_layer);
+                let cmd = CylinderCommand::new(color);
+                self.command_line.push_info(&cmd.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(cmd));
+            }
+
+            // ── EXTRUDE ────────────────────────────────────────────────────
+            "EXTRUDE"|"EXT" => {
+                use crate::modules::insert::solid3d_cmds::ExtrudeCommand;
+                // If a single entity is already selected, skip the pick step.
+                let selected: Vec<_> = self.tabs[i].scene.selected_entities().into_iter().collect();
+                let color = self.tabs[i].scene.layer_color(&self.tabs[i].active_layer);
+                if selected.len() == 1 {
+                    let handle = selected[0].0;
+                    let mut cmd = ExtrudeCommand::new(color);
+                    cmd.on_entity_pick(handle, glam::Vec3::ZERO);
+                    self.command_line.push_info(&cmd.prompt());
+                    self.tabs[i].active_cmd = Some(Box::new(cmd));
+                } else {
+                    let cmd = ExtrudeCommand::new(color);
+                    self.command_line.push_info(&cmd.prompt());
+                    self.tabs[i].active_cmd = Some(Box::new(cmd));
+                }
+            }
+
+            // ── REVOLVE ────────────────────────────────────────────────────
+            "REVOLVE"|"REV" => {
+                use crate::modules::insert::solid3d_cmds::RevolveCommand;
+                let color = self.tabs[i].scene.layer_color(&self.tabs[i].active_layer);
+                let cmd = RevolveCommand::new(color);
+                self.command_line.push_info(&cmd.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(cmd));
+            }
+
             // ── STL export ────────────────────────────────────────────────
             "STLOUT"|"EXPORTSTL" => {
                 return Task::done(Message::StlExport);