- Segmented control: replace the two free-standing bordered boxes with a
single rounded track holding two pill buttons (iOS-style), active segment
filled Amber; centred via fit-content + margin auto. Panel top-offset 44→68px.
- Hide the bottom key-bar on the home chooser (it only targets an active
terminal): updateHomeView toggles body.home-open; CSS hides #keybar.
Frontend-only. 415 tests green; both typechecks clean; verified in-browser
(toggle pill renders, keybar hidden on home, reappears when a tab opens).
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