* improvement(tabs): give the resource tabs a quieter floating look
Adds a `floating` variant to the shared TabStrip and uses it for the mothership
resource tabs. Only the active tab carries a shape; the rest are bare labels
divided by a hairline, sized to their content up to a cap. The browser and
terminal strips keep the attached look, which stays the default.
* improvement(tabs): align the floating tab ramp and icon size with the platform
Each surface token now does the job it is named for: a bare tab hovers to
--surface-hover instead of the Button variant's --surface-4, and a selected tab
takes the rung between hover and --surface-active. Tab icons match the action
icons beside them at 16px.
Waleed
c16883e9dc