Aligned constraint: axis lines, zero collapse, Properties form/reference/description, screen-sized text

Point & line and 2Lines take a text baseline or an ellipse axis as the
line; a zero value folds the points onto the first one; 2Lines turns the
second line about its start. The Properties Constraint section edits
Constraint Form (Dynamic on the *ADSK_CONSTRAINTS layer, Annotational on
the current layer), Reference (driven constraint in parentheses whose
parameter follows the measurement) and Description (stored with the
parameter and the native variable). Dynamic dimensions keep a 12 px text
and 8 px arrows at any zoom, drop trailing zeros and show formulas as
`fx: len=d1*2`; the hidden constraints layer stays out of the layer lists.

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

src/app/update/command.rs

@@ -2188,6 +2188,9 @@ pub(super) fn on_tab_close(&mut self, idx: usize) -> Task<Message> {
         field: &'static str,
         value: String,
     ) -> Task<Message> {
+        if matches!(field, "dyn_constraint_form" | "dyn_constraint_reference") {
+            return self.on_dynamic_dimension_choice(field, &value);
+        }
         let i = self.active_tab;
         let handles = self.property_target_handles(i);
 
@@ -3269,6 +3272,9 @@ pub(super) fn on_tab_close(&mut self, idx: usize) -> Task<Message> {
                 if let Some(param_field) = dynamic_field {
                     return self.on_dynamic_dimension_field_commit(field, param_field);
                 }
+                if field == "dyn_constraint_description" {
+                    return self.on_dynamic_dimension_description_commit(field);
+                }
                 let i = self.active_tab;
                 self.tabs[i].properties.active_field = None;
                 let handles = self.property_target_handles(i);