Clicking an image in the room or thread timeline now opens the same viewer
the media gallery uses — dark backdrop, sender + date, 1/N counter, ←/→ across
the room's media, +/-/0 and wheel/double-click zoom, download, jump to
message — positioned at the clicked event. RoomMediaLightbox feeds it from the
detached media timeline (#163); when the event isn't in the loaded window it
pages back (bounded, 6 pages) and shows the clicked image alone meanwhile, so
the viewer opens instantly. ImageContent gains onOpenViewer (RenderMessageContent
passes onOpenImageViewer); its built-in viewer remains for stickers, search
results, pins, notifications and avatars.
Verified headless: click → 'Media viewer' dialog focused, counter 1/2, '+' →
120 %, Jump to message present, Esc closes; an older image 10 pages up →
found at 10/45 after paging.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA
