The composer was a fixed height:3. Match free-code/opencode: native textarea
auto-grow via direct minHeight={1} maxHeight={max(6,⌊rows/3⌋)} props (opencode's
prompt sizing) — 1 row when empty, grows with wrapped/multiline content up to ~a
third of the screen, then scrolls internally. maxHeight is a DIRECT reactive prop
(not in style) so the cap tracks terminal resize via useDimensions. 85 pass;
verified live (a long wrapping line grew the box to 3 rows).
alt-glitch
080440bd9c