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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