Add a way to drop items one by one (long press)

Please add a new control option for dropping items in touch mode. Currently, tapping outside the inventory screen drops the whole stack at once. With this change: Tap outside the inventory: drop the whole stack (same as now) Long-press outside the inventory: drop items one by one in a smooth, continuous way This would make item management much more convenient, especially in situations where players want to drop only a few items without splitting stacks manually.