Building Assistant

Initial release.

• Added a hotbar-based building toolkit with automatic item distribution.

• Added hotbar item backup and recovery.

• Added a measuring tool with distance, dimensions, and volume calculations.

• Added sphere, circle, and torus generation.

• Added customizable shape materials and placement modes.

• Added structure copying and saving with 10 library slots.

• Added structure rotation, position adjustment, and placement preview.

• Added structure renaming, overwriting, and deletion.

• Added mound generation with configurable materials and diameter.

• Added spherical block replacement.

• Added a terrain smoothing brush with three strength levels.

• Added separate undo/redo histories for manual building, command changes, and building tools.

• Added English and Japanese language support.