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/DeleteDelegate.mc

@@ -0,0 +1,24 @@
+import Toybox.Lang;
+import Toybox.WatchUi;
+
+// Input for DeleteView. START/STOP starts the countdown,
+// BACK cancels at any time.
+class DeleteDelegate extends WatchUi.BehaviorDelegate {
+
+    private var _view as DeleteView;
+
+    function initialize(view as DeleteView) {
+        BehaviorDelegate.initialize();
+        _view = view;
+    }
+
+    function onSelect() as Boolean {
+        _view.startHold();
+        return true;
+    }
+
+    function onBack() as Boolean {
+        _view.cancel();
+        return true;
+    }
+}