chore(combobox): add blue focus indicator

[agliga]

Fixes #2201

• This PR contains CSS changes
• This PR does not contain CSS changes

Description

• Removed outline 0 from combobox

Screenshots

Checklist

• I verify the build is in a non-broken state

• I verify all changes are within scope of the linked issue

• I regenerated all CSS files under dist folder

• I tested the UI in all supported browsers

• I did a visual regression check of the components impacted by doing a Percy build and approved the build

• I tested the UI in dark mode and RTL mode

• I added/updated/removed Storybook coverage as appropriate

[ianmcburnie]

We might want to review whether we still want to retain the old custom focus indicator as well. But at least this is consistent with textbox behavior for now.

skin/dist/combobox/combobox.css

Line 200 in a836816

border-color: var(--combobox-textbox-focus-border-color, var(--color-foreground-primary));