Allow changing pixel size

[knavekaiser]

Clear and concise description of the problem

The app only allows changing the shapes of the pixels but does not allow resizing.

Suggested solution

We need the ability to resize pixels to make them larger or smaller according to our needs.

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.