- Add mod_assets for weaveloader.api:missing_block and missing_item
- CopyModAssets target to deploy placeholders to mods/WeaveLoader.API/assets/
- WorldIdRemap: use placeholder icons instead of bedrock/apple
- Clear invalid block IDs before setTile to prevent setTileAndData crashes
- Add CompressedTileStorage::set for direct block write when Tile::tiles[old] is null
- Use missing block placeholder with API-resolved IDs instead of bedrock
- Work around raw_pdb GetRecordAtOffset removal via ForEachSymbol iteration