Delete markers on Alt-click

Fixes #1257

Co-Authored-By: GPT-5.6-Luna <noreply@openai.com>

crates/ui-egui/src/edit_window/rulers.rs

@@ -222,7 +222,8 @@ pub(super) fn draw_rulers(app: &mut SoundApp, ui: &mut Ui, area: Rect, tl: Rect,
                     } else if resp.clicked()
                         && let Some(m) = hit
                     {
-                        let _ = app.run("markers.recall", json!({"number": m.number}));
+                        let command = if ui.input(|i| i.modifiers.alt) { "markers.delete" } else { "markers.recall" };
+                        let _ = app.run(command, json!({"number": m.number}));
                     }
                 }
             }

crates/ui-egui/src/edit_window/tests.rs

@@ -1508,3 +1508,20 @@ fn alt_click_on_a_breakpoint_deletes_it() {
         assert_eq!(h.state().engine.session().track(track).unwrap().clips(), clips.as_slice(), "{tool}");
     }
 }
+
+#[test]
+fn alt_click_on_a_marker_deletes_it() {
+    let mut engine = soundcraft_engine::demo::demo_engine();
+    engine.session_mut().edit.rulers = vec!["markers".into()];
+    engine.execute("markers.add", &json!({"at": 48_000, "name": "Alt-delete me"})).unwrap();
+    let mut h = harness_with(engine);
+    let s = h.state().engine.session_arc();
+    let marker = s.markers.iter().find(|m| m.name == "Alt-delete me").unwrap();
+    let at = pos2(x_of(&s, timeline(&h), marker.start), timeline(&h).min.y - 11.5);
+    let before = s.markers.len();
+
+    click_with(&mut h, at, egui::Modifiers::ALT);
+
+    assert_eq!(h.state().engine.session().markers.len(), before - 1);
+    assert!(!h.state().engine.session().markers.iter().any(|m| m.name == "Alt-delete me"));
+}