Reduce reasoning viewport max height on mobile (#2263)
Drop the streaming-reasoning viewport from 320px to 224px (~30% less) on
screens narrower than the md breakpoint. Desktop keeps the existing 320px
ceiling so longer chain-of-thought stays readable on larger viewports.
https://claude.ai/code/session_01PD3VAeKBX6HDRLCvH7H5Hs
Co-authored-by: Claude <noreply@anthropic.com>
