Chest Upgrade

## Chest Upgrade — 0.2.18 VV

### Improvements
- Closing the upgrade menu no longer consumes the chest’s attempt. Selecting **Keep Items** still completes the attempt without changing its contents.
- Added verification of inventory changes and restoration of original items when recoverable errors occur.
- Added a persistent safeguard against repeated rolls after interrupted or unverified operations.
- Added paginated upgrade details showing the original item, upgraded item, and exact quantities for every improved stack.
- Upgrade chances displayed in the menu now come directly from the actual rules, including coal, sticks, and rotten flesh.
- Added localized menus and messages in **English, Brazilian Portuguese, and Spanish**.
- Added a short upgrade sound and colored highlights for rarer results.

### Preserved
- Existing upgrade probabilities, loot tables, textures, and pack UUIDs.
- The first-opening workflow: open the chest to generate its loot, then close the inventory to access the upgrade menu.

### Validation
- Passed JSON and JavaScript