Dimensional constraints: DCFORM, DIMCONSTRAINT options, -PARAMETERS, value prompt, save without display overrides

DCFORM sets the annotational or dynamic form and continues into the
DIMCONSTRAINT option prompt, whose wording and last-used default match the
reference. -PARAMETERS manages parameters from the command line; a
double-clicked constraint dimension opens its value prompt. Dynamic
dimensions rescale on every camera change and their display overrides stay
out of the saved file. A driving dimension between an entity's own ends no
longer has its length retained, so a new value moves the second point along
the dimension axis; parameter edits hold the first constraint point.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/app/update/file.rs

@@ -1464,7 +1464,7 @@ impl OpenCADStudio {
 
         self.prepare_native_save(i);
         let version = self.tabs[i].scene.document.version;
-        let snapshot = self.tabs[i].scene.document.clone();
+        let snapshot = self.tabs[i].scene.document_for_save();
         crate::io::save_owned_as_version_atomic(
             snapshot,
             &path,
@@ -1893,7 +1893,7 @@ impl OpenCADStudio {
         path: std::path::PathBuf,
     ) -> Task<Message> {
         let i = self.active_tab;
-        let document = self.tabs[i].scene.document.clone();
+        let document = self.tabs[i].scene.document_for_save();
         let handles: Vec<_> = self.tabs[i].scene.selected.iter().copied().collect();
         let worker_name = block_name.clone();
         let worker_path = path.clone();
@@ -2298,7 +2298,7 @@ impl OpenCADStudio {
             crate::ui::wrap_bar::dropdown_bounds(crate::app::view::VIEWPORT_CAPTURE_BOUNDS_ID)
         });
         let clone_started = iced::time::Instant::now();
-        let mut snapshot = self.tabs[i].scene.document.clone();
+        let mut snapshot = self.tabs[i].scene.document_for_save();
         // Save-As across folders: rebase relative reference paths onto the
         // new base dir inside the snapshot only (live strings are untouched).
         if purpose == crate::app::SavePurpose::SaveAs {

src/app/update/viewport.rs

@@ -5060,6 +5060,15 @@ properties={:.1}ms picked={}",
                     {
                         return Task::none();
                     }
+                    // A constraint dimension edits its parameter from the
+                    // command line, standing in for the reference's in-place
+                    // value editor.
+                    if let Some(prompt) = self.dynamic_dimension_value_command(i, handle) {
+                        use crate::command::CadCommand;
+                        self.command_line.push_info(&prompt.prompt());
+                        self.tabs[i].active_cmd = Some(Box::new(prompt));
+                        return Task::none();
+                    }
                     // Any text-bearing entity opens its in-place editor
                     // (plain box or rich MText editor, per type). A
                     // Leader resolves to the entity it annotates.