Whats Next? 0.18.3 - Weapon two-column layout

- Equipment Loot Test: Main Hand and Off Hand are now shown side by side in two separate columns.
- Each weapon column has its own KEYS / RAID / VOID CORE / CRAFT source grid.
- Added a separator between the two weapon columns.
- Existing item size, loot synchronization, tooltip, Void Core and obtained-state logic are unchanged.
