Feat: PEDIT command (PE) — polyline edit (close/open/width)

Entity pick → text input subcommands:
  C / CLOSE  → set closed flag
  O / OPEN   → clear closed flag
  W <value>  → set uniform width on LwPolyline vertices
  X / EXIT   → cancel

Command stays active after each op (CmdResult::PeditOp) for multiple edits.
Supports LwPolyline and Polyline2D.

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

src/app/commands.rs

@@ -1018,6 +1018,13 @@ impl H7CAD {
                 self.tabs[i].active_cmd = Some(Box::new(cmd));
             }
 
+            "PEDIT"|"PE" => {
+                use crate::modules::home::modify::pedit::PeditCommand;
+                let cmd_obj = PeditCommand::new();
+                self.command_line.push_info(&cmd_obj.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(cmd_obj));
+            }
+
             "ALIGN"|"AL" => {
                 use crate::modules::home::modify::align::AlignCommand;
                 let cmd = AlignCommand::new();