Aligned constraint: 2Lines turns the second line with the plain Parallel solve

Only the first line's ends are pinned while the second line is made
parallel, the way the Parallel constraint itself moves it; the distance
is then measured on the solved geometry.

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

src/app/command_driver.rs

@@ -4000,13 +4000,11 @@ impl OpenCADStudio {
                         id,
                         self.constraint_bar_display,
                     );
-                    // The first line stays; the second turns about its start
-                    // to run parallel, as the reference keeps that start.
-                    let mut pins = first_ends.to_vec();
-                    pins.push(second_ends[0]);
+                    // The first line stays; the second turns parallel the way the
+                    // Parallel constraint itself moves it.
                     self.tabs[i].scene.bump_entities_with_parametric_policy(
                         &[(second_line.entity, crate::scene::ChangeKind::Modified)],
-                        &pins,
+                        &first_ends,
                         self.constraint_solve_mode,
                     );
                     self.tabs[i].dirty = true;