Create Piece Promotion Popup

[Notdutra]

Description
Currently, pawn promotion defaults to a queen. This issue will add a popup menu allowing players to select the piece they want for promotion (queen, rook, bishop, or knight).

Acceptance Criteria

• Popup Display: Show a popup menu when a pawn reaches the final rank, allowing the player to choose a promotion piece.
• Piece Selection: Include options for queen, rook, bishop, and knight.
• Promotion Logic: Update the board with the selected piece.

Tasks

• Design the promotion selection popup.
• Implement popup logic to appear upon pawn promotion.
• Update pawn promotion function to place the chosen piece on the board.

Additional Notes

• Ensure the popup appears only when a pawn reaches the promotion rank.
• Confirm that the chosen piece is placed correctly on the board.