Copper Storekeeper

- Bob now fills chests from left to right and treats double chests as one container
- Tops up partial stacks before using empty slots
- Every chest Bob puts items into gets tidied: stacks merged, items sorted, no gaps
- When there's nothing to carry, Bob walks around the warehouse and tidies messy chests (each chest at most once a minute, never while a player is standing next to it)
- Ledger status now shows how many chests Bob has tidied