OpenShulker

• Crash Auto‑Rollback
  Before a shulker box is opened, its original contents are atomically persisted to disk (JSON). If the server crashes, the contents are automatically restored on next startup or player join – guaranteeing that items are never duplicated or lost.
  If the atomic flush fails before opening, the open operation is rejected, ensuring a strong safety boundary.

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Removals (Simplifications)

• Removed the redundant protection against “dragging a shulker box with the mouse into inventory” – this was duplicative with slot lock and incorrectly blocked legitimate actions.
• Removed death‑drop recovery. The logic is now simpler: on death, only the editing state is discarded; items themselves are not lost, so no special recovery is needed.

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Retained Features (All Vanilla‑Style Convenience)

• Double‑click to collect all items of a type
• Drag‑to‑distribute items
• Shift‑click quick moves
• Number keys and scroll wheel support
• Slot locking
• Stack rejection (prevent unwanted stacking)
• Save on exit / close
• onDisable protection