Improve the inventory system to function more efficiently, similar to an RPG-style setup. Add keyboard shortcuts for inventory slots, such as F1, F2, F3, F4, F5, F6, F7, F8, and F9. When the player presses B, the inventory should appear on the left side of the screen. Players can drag items into these shortcut slots to quickly assign them for use.

For consumable items with a stack limit of 99 per slot, ensure the shortcut remains functional even after one stack is depleted. If additional stacks of the same item exist in the inventory, the shortcut should automatically use items from those stacks. Currently, when a slot is depleted, the shortcut is disabled or reset, which disrupts gameplay.

Additionally, display a data tracker in the inventory system showing the total number of items currently stored and the number of available slots. This provides players with a quick overview of their inventory space, making management easier and more intuitive.