Add moveToTable context menu action and extract tableRowToGridY helper (#6738)

Adds a Table option to the Move menu, allowing cards to be moved directly to the battlefield from any zone. Extracts the repeated tableRow-to-grid-Y conversion logic into TableZone::tableRowToGridY(), consolidating five call sites and fixing a latent bug where cards with tableRow > 2 could land on the wrong row.

cockatrice/src/game/player/menu/move_menu.h

@@ -23,6 +23,7 @@ public:
     QAction *aMoveToBottomLibrary = nullptr;
 
     QAction *aMoveToHand = nullptr;
+    QAction *aMoveToTable = nullptr;
     QAction *aMoveToGraveyard = nullptr;
     QAction *aMoveToExile = nullptr;
 };