feat(modify): commercial solutions keyword options for MOVE, COPY, FILLET, CHAMFER, OFFSET

MOVE: Displacement, Enter at the second point uses the base as the vector.
COPY: Displacement, mOde (Single/Multiple), Undo of the last copy.
FILLET: Undo of the last fillet (the command refreshes its entity cache
through the new CadCommand::on_document_undone hook after the host undoes
the document step). CHAMFER: Multiple and Undo. OFFSET: Erase (the offset
replaces its source), Layer (Current/Source), Undo, Exit.
POLY3D, TRACE, MIRROR and MEASUREGEOM expose the keywords they already
accepted as options, so the context menu and option buttons list them.

The pinned prompt now keeps informational bracket groups such as
"[3 objects]" and only drops real option listings when the buttons take over.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/modules/draw/inquiry/measuregeom.rs

@@ -227,6 +227,19 @@ impl CadCommand for MeasureGeomCommand {
         self.mode == Mode::Choose
     }
 
+    fn options(&self) -> Vec<crate::command::CmdOption> {
+        use crate::command::CmdOption;
+        if self.mode != Mode::Choose {
+            return Vec::new();
+        }
+        vec![
+            CmdOption::new("Distance", "D"),
+            CmdOption::new("Radius", "R"),
+            CmdOption::new("Angle", "A"),
+            CmdOption::new("ARea", "AR"),
+        ]
+    }
+
     fn on_text_input(&mut self, text: &str) -> Option<CmdResult> {
         if self.mode != Mode::Choose {
             return None;