- Use the split navigation on foldable iPhones once UIHingeInteraction
(iOS 27.1+) reports a hinge: unfolded shows sidebar + chat, folded
collapses to the phone stack without recreating the chat.
- Side-by-side sidebar: drop the truncated inline "Sessions" title and
move the filter beside the hub menu (also fixes iPad).
- Folded outer screen: drop the home title so the empty bar disappears,
use the leading-aligned system title/subtitle in chat, minimize the
chat title on scroll, and let the composer sit 16pt closer to the home
indicator while the text field is unfocused.
- Qualify Markdown.Document, which is ambiguous with the iOS 27.1 SDK.
- test-transcript.sh picks the newest runtime that supports the device
type (iOS 27.1 only ships iPhone Duo); split tests run on iPhone Duo.
