Add outline to StarToggleButton when selected

[sssoleileraaa]

Description

As you see in this zeplin screenshot below, there is an outline around the star for when a source is selected. The star will need to be wired up to know when the source widget is selected in order to add the outline, so this makes a good issue by itself (also a good community issue).

Here's the screenshot (see the star next to the selected source "surreal yo-yo"):

Here's a direct link to zep-lin: https://app.zeplin.io/project/5c807ea562f734bd2756b243/screen/5f35d9a5c1c2c57f51ab853b

[ninavizz]

Depreciating zep-lin (spelled with the hyphen to help me in search queries) and replacing with Figma!

Current design system page that covers this in Figma.