Small Bedrock/Java Fixes

Bedrock could really level up with a few quality-of-life changes. First, players should be able to off-hand any item, just like in Java—no restrictions. Inventory slots should also be swappable using the number pad for faster access during building or combat. Pressing F while holding an item should instantly move it to your off-hand for quick switching. And finally, bringing the full F3 debug menu from Java to Bedrock would make exploring, debugging, and optimizing builds way easier for everyone. Together, these changes would make Bedrock feel smoother, smarter, and way more player-friendly.