Chessboard knight move

I'll create an interactive chessboard where you can place a knight and see all its possible moves highlighted. You'll be able to click on any square to place the knight and then click on the highlighted squares to move it around the board!

Analyze the following errors and fix them:

• TypeError: z(...).some is not a function

I'll fix the TypeError by ensuring the possibleMoves array is properly handled and always returns an array when checking for possible moves.

Analyze the following errors and fix them:

• TypeError: (intermediate value).some is not a function

I'll fix the TypeError by ensuring the possibleMoves derived value always returns a proper array and adding safety checks for all array operations.