- #4: on back, reveal the chat list UNDERNEATH with a parallax slide-in while the conversation slides
off to the right (slide the whole .content, list forced visible beneath) — matches the Teams push/pop.
- #8: swipe left/right in the image viewer flips to the prev/next image (not just swipe-down to close).
- #7: re-pin to the bottom as each image finishes loading (when near bottom), so late images don't
reflow/'dance' the thread.
Build marker -> 2026-07-17-batch94.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>