feat: LOFT command — ruled-surface loft through multiple cross-sections

Picks 2+ profile entities (closed or open wires), builds ruled shells
between consecutive pairs via builder::try_wire_homotopy, caps closed
ends with planar faces, and tessellates the result into a Solid3D mesh.

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

src/app/commands.rs

@@ -3466,6 +3466,15 @@ impl H7CAD {
                 self.tabs[i].active_cmd = Some(Box::new(cmd));
             }
 
+            // ── LOFT ───────────────────────────────────────────────────────
+            "LOFT" => {
+                use crate::modules::insert::solid3d_cmds::LoftCommand;
+                let color = self.tabs[i].scene.layer_color(&self.tabs[i].active_layer);
+                let cmd = LoftCommand::new(color);
+                self.command_line.push_info(&cmd.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(cmd));
+            }
+
             // ── OBJ import ───────────────────────────────────────────────
             "IMPORTOBJ"|"OBJIMPORT" => {
                 return Task::done(Message::ObjImport);