[VisualDatabase] Keep the card grid scrolling on macOS (#7764)

* [VisualDatabase] Keep the card grid scrolling on macOS

The view ignored the wheel whenever the vertical scroll bar was not
visible. On macOS, scroll bars are transient: once the fade-out finishes,
QScrollbarStyleAnimation hides the scroll bar widget, so isVisible() then
reports false even though the grid has more rows to scroll. Scrolling was
dead until something else brought the bar back.

Gate on the scroll bar's range instead: it says whether there is anything
to scroll, while visibility is only about presentation. An event with no
range to scroll is still ignored, so an enclosing scroll area can take it.

* Update card_database_visual_view.cpp

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/interface/widgets/visual_database_display/card_database_visual_view.cpp

@@ -130,8 +130,11 @@ void CardDatabaseVisualView::wheelEvent(QWheelEvent *event)
         return;
     }
 
+    // macOS uses transient (overlay) scroll bars that hide themselves
+    // once they fade out, so we need to use the range to determine if we ignore the wheel when there is nothing to
+    // scroll. This lets an enclosing scroll area take over.
     QScrollBar *bar = verticalScrollBar();
-    if (!bar->isVisible()) {
+    if (bar->maximum() <= bar->minimum()) {
         event->ignore();
         return;
     }