fix(blocks): a dynamic block copied to another drawing stays dynamic (#1816)

Only the definition's entities crossed drawings: its record's object
graph (parameters, visibility states, grips) stayed behind, and a
reference showing an evaluated copy lost the link to its definition.
The clipboard now captures the graph and the dynamic definition of an
evaluated reference, and paste and the block palette's insert-from-file
recreate them on the new records, re-pointing members and element tags.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/commands/refedit.rs

@@ -915,8 +915,8 @@ impl OpenCADStudio {
                 }
                 Some(crate::app::BlockDef {
                     name: used,
-                    base_point: def.base_point,
                     entities,
+                    ..def.clone()
                 })
             })
             .collect();