Grid Size Selector

[pexeixv]

Goal:
Allow users to choose different grid sizes for the canvas.

Requirements:

• Toolbar dropdown to select grid sizes (e.g., 8x8, 16x16, 32x32).
• Resizes the grid while preserving painted pixels if possible.
• Update Undo/Redo history accordingly.

Notes:
Helps users create both small and large-scale pixel art.