Introduce slider to size options

Sliders are more intuitive and have a direct feedback of changes user is making. Instead of providing three options for sizes and a number field, we should replace those three buttons with a slider (see the attached mockup screenshot).

1. Dragging the slider would change the value in the field automatically.

2. Modifying the value manually would move the slider

3. As we don't have any other measure, "px" should be outside of the field

4. Potentially, "Original button" could be replaced by adding the fourth tick mark to the slider. So, those tick marks would be "Small", "Medium", "Large", "Original".

   • Tick marks should also be "sticky"