Structure Editor v1.4.1

Fix: save_structures was silently dropping entities that lived in cold chunks around a structure block.

The save path only force-loaded the chunk holding the structure block itself. Vanilla's saveStructure then iterates entities across the structure's captured volume, but the entity sections in the neighbouring chunks were never loaded, so armour stands, item frames, and any mobs baked into a piece disappeared from the save. A workaround was to scan the area first (which loaded the chunks) and re-save.

Now save_structures computes the world-space bounds from the SB's offset + sizeX/Y/Z and force-loads every chunk that overlaps them before triggering the save, matching the pattern SBS itself uses in GlobalSaveTask. LOAD/CORNER/DATA-mode structure blocks are skipped since they carry no bounds.

No API changes.