Claude 2.1.280 renders inline by default: no alt screen, no mouse tracking, transcript in real scrollback. The version-only gate still sent every wheel tick and touch swipe as SGR reports, which Claude ignores, so scrolling a Claude session was dead while codex (routed locally) worked. Gate forwarding on the server-recorded cliMouseTracking flag, which fullscreen mode (CLAUDE_CODE_NO_FLICKER=1) sets.
The phone block lifted the toolbar (and padded .main) by (100vh - --app-height) on iOS Safari to clear a bottom bar that position: fixed elements were assumed to sit behind. On iPhone Safari fixed elements already stop above the bar, and 100vh is the large viewport with the bar collapsed while --app-height is the visual viewport with it expanded, so the expression measures the bar's collapsible height and shows up as an empty band between the toolbar and the bar whenever the bar is expanded. The terminal was padded by the same amount.
The lift is now --chrome-overlap, set in updateAppHeight() as innerHeight minus the visual viewport height: the distance the layout viewport that anchors fixed elements extends past the visible area. That is 0 on iPhone Safari, so the toolbar meets the bar, and it is the overlap itself on any browser where fixed elements really do land behind the chrome, so those keep the lift. The keyboard-visible rules, which already override the toolbar offset, are unchanged.
The phone tier stopped at innerWidth < 430 and @media (max-width: 430px), so every current large phone landed in the tablet layout: the 430pt iPhone 14 Pro Max, 15 Plus, 15 Pro Max and 16 Plus, the 440pt iPhone 16 Pro Max and 17 Pro Max, Pixel 6 Pro, 7 Pro and OnePlus 12 Pro, the 448pt Pixel 8 Pro and 9 Pro XL, and the Galaxy Z Fold 5 cover screen at 460. On those devices the header icon row replaced the session pill, the toolbar kept the desktop Run Shell button instead of Enter and the mic, the keyboard accessory bar could never become visible because its .visible rule lives inside the phone block, and the toolbar jumped to the top of the page when the keyboard opened.
The new cutoff is 600, the line test/mobile/devices.ts already draws between large phones (430-599) and small tablets (600-767). No physical device sits between 480 and 600, but a phone zoomed out one or two steps in Safari does: a 440pt iPhone at 85% or 75% page zoom reports 518px or 587px and still needs the phone controls, which a 480 cutoff would have taken away. The phone block is max-width: 599px and the tablet block starts at min-width: 600px, so a 600px device is a tablet in CSS and in getDeviceType() alike instead of straddling the boundary the way 430pt phones did.
The number changes everywhere it is encoded: JS, CSS, comments, CLAUDE.md, the CI tests that pin the phone block, and the test:mobile helpers. Measurement history that names 430px stays as written.
JD