Traveler's Backpack

✨ Added Polymorph compatibility (if Polymorph installed, recipe conflicts show polymorph recipe selector button in backpack crafting upgrade tab)
✨ Added resetting backpack if clicked on backpack placed in the world with shift + right-click while holding Blank Upgrade
🔧 Leather is required again in first slot to apply backpack tier upgrades in smithing table
🔧 Improved ability ticking logic
🔧 Sleeping bag tweaks
🐛 Fixed bundle/shulkerbox saving issue inside backpack container