YMAP Vegetation Bitset Converter

Repairs broken vegetation bitsets (grass, bush, tree, rock) in exported YMAP XML files by transferring the correct values from the original. Everything runs locally in your browser.

Matching: primarily by order (identical batch count + archetypes), otherwise by fingerprint (archetype + instance count + positions). A bitset is only transferred when both batches' GridSizeX/Y and RowSpan match — otherwise it's skipped (warning). The rest of the file stays unchanged.