Fix inventory editor crashes and UI hover behavior

[ZeroTraceAPI]

Stability and UI Fixes for Multi_Plugins.py

This PR contains several targeted fixes for the inventory editor and main plugin UI.

Fixed

• Fixed item_atlas.json resource path loading failures
• Prevented inventory editor crashes when atlas resources are unavailable
• Fixed crash when saving empty item names or lore
• Fixed tooltip and button hover flickering
• Fixed hover highlight state remaining active after mouse leave
• Fixed tooltip positioning near screen edges

Improved

• Added safer fallback handling for resource loading
• Improved tooltip timing and cancellation behavior
• Improved UI responsiveness and hover consistency

Testing

Tested in Amulet with Bedrock worlds:

• Inventory editor open and close cycles
• Item name and lore editing
• Enchantment editing and removal
• Hover stress testing across buttons
• UI repositioning near screen edges
• Restart / reload testing

No intentional functionality, NBT format behavior, or gameplay-related changes were introduced outside of the fixes above.