Equal follow-ups: one glyph per object, unshown Multiple bars, typed object picks

- An object that carries several Equal relations shows a single "="
  badge, as the reference does, instead of one stacked badge per relation.
- A pick made in the Multiple flow leaves its new constraint bar unshown
  until the object is selected or bars are shown, matching the reference;
  the single flow still shows the bar at once.
- A typed coordinate at the Fix `Select object:` prompt and at the
  Horizontal/Vertical `Select an object or [2Points]` prompt picks the
  object under that point, like a click, instead of being read as a point.

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

src/app/command_driver.rs

@@ -3429,10 +3429,12 @@ impl OpenCADStudio {
                         .scene
                         .parametric_constraint_set_mut(scope)
                         .add(ConstraintKind::Equal, vec![first, *follower], None);
+                    // A Multiple pick leaves its new bar unshown, as the
+                    // reference does; the single flow shows it at once.
                     self.tabs[i].scene.note_parametric_constraint_applied(
                         scope,
                         id,
-                        self.constraint_bar_display,
+                        if multiple { 0 } else { self.constraint_bar_display },
                     );
                 }
                 let changes = touched