[Client] Show horizontal art for plane and siege cards in the profile banner (#7118) (#7250)

Use the landscape orientation flag to rotate sideways-layout card art
upright before cropping, so planes/sieges show their horizontal art as
the server profile banner card instead of a rotated full card.

- Curve cropCardArt around the card's landscapeOrientation flag with
  landscape-specific art margins (mirrors CardInfoPictureWidget)
- Add shared CardArtUtils::rotateSidewaysLayoutArt helper and apply it
  to the playmat (game render and settings preview) and card info widget,
  replacing three duplicate 90-degree rotation blocks

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

cockatrice/src/interface/widgets/cards/card_art_utils.cpp

@@ -0,0 +1,18 @@
+#include "card_art_utils.h"
+
+#include <QTransform>
+#include <libcockatrice/card/printing/exact_card.h>
+
+namespace CardArtUtils
+{
+QPixmap rotateSidewaysLayoutArt(const QPixmap &art, const ExactCard &card)
+{
+    if (!card.getInfo().getUiAttributes().landscapeOrientation) {
+        return art;
+    }
+
+    QTransform transform;
+    transform.rotate(90);
+    return art.transformed(transform, Qt::SmoothTransformation);
+}
+} // namespace CardArtUtils