ChessBoard

Added chess with individual piece models

Added ChessLogic that implements standard chess rules

Registered chessboard blocks, items, models, and textures

Added 12 piece model blocks (6 types × 2 colors) for visual rendering

Fixed missing toggleSide in tic-tac-toe undo logic

Fixed the issue where using a non-sneak hotkey + right-click to open the interface would incorrectly manipulate pieces

Due to the file being mistakenly published under version 0.0.1, the version was not visible for download. Attempts to relocate the file were unsuccessful, necessitating a re-upload.

If possible, we would appreciate it if the '+ Add Additional File' option under the version section could be made more explicit, as it is currently too ambiguous and easily leads to misunderstanding.