Phase 5: delete last event with confirmation countdown

Two-step delete: navigate to "Letzten löschen", press START/STOP
to open confirmation, press again to start 2.5s red arc countdown.
BACK cancels at any point. Currently uses click-to-start instead
of press-and-hold due to simulator key event limitations.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

source/MenuDelegate.mc

@@ -33,7 +33,8 @@ class MenuDelegate extends WatchUi.BehaviorDelegate {
             return true;
         }
         if (key.equals(Config.ACTION_DELETE)) {
-            // Phase 5
+            var view = new DeleteView();
+            WatchUi.pushView(view, new DeleteDelegate(view), WatchUi.SLIDE_LEFT);
             return true;
         }