[Woo POS] Cart item list polishes

[jaclync]

In the cart item list, there are some polishes we could make:

Building stage: when there are items taller than the scroll view

• When scrolling down the list, the title view bottom shadow should have a gradient to clear color so that the content below is visible

• When scrolling to the bottom of the list, the bottom shadow of the last item should be visible

Finalizing stage:

The last item should be fully above the floating control.

[dangermattic]

Thanks for reporting! 👍