feat(ui): compatible right-click context menu driven by command options

The viewport context menu is now built from a pure model
(ui::popup::context_menu) rendered by the overlay: while a command runs it
offers Enter / Cancel / every keyword of the command's options() with the
keyword shown as a hint, a Recent Input submenu and M2P; when idle it offers
Repeat, Recent Input, Clipboard, Undo/Redo with history labels, the edit
block (Erase/Move/Copy/Scale/Rotate/Mirror/Draw Order), Isolate, Pan/Zoom,
selection tools, Properties and Options. The default row is anchored under
the pointer and the menu is keyboard-navigable (arrows, Enter, mnemonic
letters; any other key closes it and types into the command line).

Right-click behaviour is a user preference (Options → User Preferences,
SHORTCUTMENU / SHORTCUTMENUDURATION): shortcut menu (commercial solutions default),
time-sensitive, or the previous Enter-first cycle.

LINE gains options() (Close/Undo/eXit).

Co-Authored-By: Claude Opus 5 <[email protected]>

src/app/command_driver.rs

@@ -783,6 +783,9 @@ impl OpenCADStudio {
             }
             return Task::none();
         }
+        // Keywords, distances and points fed here (option buttons, the
+        // context menu, scripts) join the Recent Input list like typed ones.
+        self.command_line.record_recent_input(token);
         let is_mtp = token.trim_start_matches('_').eq_ignore_ascii_case("MTP")
             || token.trim_start_matches('_').eq_ignore_ascii_case("M2P");
         if is_mtp {