3-agent survey of the in-call UI at phone width + 2-agent review of the staged diff. All changes are mobile-gated CSS (mobile-first @media on Compound tokens), so desktop rendering is provably unchanged. - CallFooter: wrap the control row and tighten gap/padding at <=500px so the buttons (incl. the destructive hangup) can never be clipped by the grid's overflow-x:hidden. A loudspeaker button was added to the bar without a shed rule, pushing 6-7 lg buttons past the viewport at 320-500px. - OneOnOnePortraitLayout: give the 1:1 self-view the same safe-area-aware inset as SpotlightExpandedLayout so it clears the home indicator / floating footer (was a bare 16px inset). Phone-only layout. - GridTile: enlarge the always-visible camera-flip control to a 44px touch target on coarse pointers (was ~28px). - ReactionToggleButton: enlarge reaction-picker emoji buttons to 44px at <=420px (were ~32px); five still fit a 360px drawer row. - Tabs: scroll the horizontal tab row on the inline axis (overflow-x) so the Settings tabs don't clip in a phone drawer. - SpotlightLandscapeLayout: shrink the 180px filmstrip rail to 132px on short landscape phones (max-height:400px) so the spotlight isn't a sliver. Gates: tsc 0, prettier clean, affected vitest pass. No TS changed. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>