Add Linear Gradient to Tabs when modality exits

[josh-bagwell]

🚀 Feature Proposal

Tabs should have a linear-gradient on the side that has overflow (i.e. right side for left-to-right and left side for right-to-left).

Currently we do not have a linear-gradient until the Tabs overflow is dragging. Once it is dragging, a linear-gradient appears on the side that the user is dragging towards. See screenshots below for examples.

Motivation

This gives the user a better indicator that there is content to scroll.

Example

Current: No linear-gradient and will cut off on one side

Proposed: linear-gradient now gives a better indicator that there is content to scroll.