fix swap and drop for oversized slots

[romanfedyniak]

Previously, actions like dropping items (CTRL+Q) and hotbar swapping (number keys 1-9) completely ignored getMaxStackSize() and slot limits. This allowed players to move entire oversized stacks into standard inventories or drop them into the world with values exceeding normal limits.

Changes Made

• Fixed CTRL+Q: Intercepted item drops from oversized slots to properly respect vanilla limits.
  • CTRL+Q now drops a maximum of one vanilla stack (e.g., 64 for stone, 1 for tools) per action.
• Fixed Hotbar keys 1-9: Intercepted number key swaps to enforce slot limits when interacting with oversized slots.
  • Same items: Safely merges the stack up to the target slot's getItemStackLimit.
  • Different items: Swaps only if both stacks safely fit within the limits of their respective new slots. Otherwise, handles partial moves to empty slots.