Add clicked() signal to SwipeArea

Emit clicked() when a press-and-release occurs without any swipe
movement. This allows consumers to distinguish taps from swipe
gestures on the same surface.

components/mobileshell/components/swipearea.cpp

@@ -309,6 +309,9 @@ void SwipeArea::handleReleaseEvent(QPointerEvent *event, QPointF point)
     // if we are in a swipe
     if (m_moving) {
         Q_EMIT swipeEnded();
+    } else if (m_pressed) {
+        // No swipe occurred — this was a click/tap
+        Q_EMIT clicked();
     }
 
     resetSwipe();

components/mobileshell/components/swipearea.h

@@ -63,6 +63,8 @@ Q_SIGNALS:
     void touchpadScrollEnded();
     void touchpadScrollMove(qreal totalDeltaX, qreal totalDeltaY, qreal deltaX, qreal deltaY);
 
+    void clicked();
+
 protected:
     bool childMouseEventFilter(QQuickItem *item, QEvent *event) override;
     void mouseMoveEvent(QMouseEvent *event) override;