Fix tap-to-rotate and GPS cancel crash

- Tap on non-selected icon rotates instead of opening, flag
  prevents onSelect from double-firing
- GpsService.stop() for clean cancellation
- LoadingView stops GPS on hide (BACK button)
- LoadingDelegate allows BACK to cancel GPS acquisition

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

source/MenuDelegate.mc

@@ -7,6 +7,7 @@ import Toybox.WatchUi;
 class MenuDelegate extends WatchUi.BehaviorDelegate {
 
     private var _view as MenuView;
+    private var _tapHandled as Boolean = false;
 
     function initialize(view as MenuView) {
         BehaviorDelegate.initialize();
@@ -28,18 +29,24 @@ class MenuDelegate extends WatchUi.BehaviorDelegate {
         var tapX = coords[0] as Number;
         var tapY = coords[1] as Number;
         var idx = _view.itemIndexAt(tapX, tapY);
-        if (idx < 0) { return false; }
 
-        if (idx == _view.selectedIndex()) {
-            // Tap on already-selected item → open it.
-            return _openSelected();
+        if (idx >= 0 && idx != _view.selectedIndex()) {
+            // Tap on non-selected icon → rotate to it, block onSelect.
+            _view.rotateTo(idx);
+            _tapHandled = true;
+            return true;
         }
-        // Tap on another item → rotate to it.
-        _view.rotateTo(idx);
-        return true;
+
+        // Tap on selected icon or empty area → let onSelect handle it.
+        return false;
     }
 
     function onSelect() as Boolean {
+        // If a tap already handled this event, skip.
+        if (_tapHandled) {
+            _tapHandled = false;
+            return true;
+        }
         return _openSelected();
     }
 
@@ -58,7 +65,7 @@ class MenuDelegate extends WatchUi.BehaviorDelegate {
             return true;
         }
 
-        WatchUi.pushView(new LoadingView(key), null, WatchUi.SLIDE_IMMEDIATE);
+        WatchUi.pushView(new LoadingView(key), new LoadingDelegate(), WatchUi.SLIDE_IMMEDIATE);
         return true;
     }
 }