Mobile-audit batch 1. All fixes reuse cinny's own responsive primitives and are
mobile-gated so desktop is unchanged.
- Message tables: wrap <table> in an overflow-x container so a wide table scrolls
instead of overflowing the message column / page body.
- Composer toolbar: let the before|editable|after row and the toolbar wrap on
phones (@media <=750px) instead of squeezing the editable to zero and pushing
Send off-screen.
- In-call control bar: collapse to the compact/stacked layout on a mobile
viewport (ScreenSize.Mobile) too, not just when the bar's own container is
<500px — fixes the 500-750px band where the control row overflowed.
- URL-preview card: base width toRem(400) -> min(25rem, 92vw) so a single card
fits a narrow phone (still exactly 400px on desktop).
- Explore card grid: drop to one column at <=750px (was a fixed 3-col grid).
Two review passes: desktop behavior provably unchanged (all gated by @media /
ScreenSize.Mobile; the table wrapper only contains previously-overflowing tables).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>