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473d592602
Follow-up to [#9243 read tall mentions](https://github.com/block/buzz/pull/9243). **Problem.** Since #9243, the newest reply in a thread is read once its end shows at the live bottom, even when it is taller than the screen. The thread view decides "at the tail" from scroll geometry that ignores the keyboard. On Android, with the keyboard open and tail-follow detached, the last reply can sit at the scroll end but entirely behind the keyboard, and it gets marked read. The mark stays after the keyboard closes, so a mention there can be cleared without ever being seen. **Fix.** The thread's live bottom now also requires the tail row's end to be inside the reading area, above the keyboard and composer. This matches how the channel timeline already checks its bottom row. ### Validation - Added test: a thread whose last reply sits behind the Android keyboard leaves it unread, including after the keyboard closes. It fails without the guard. - Full mobile suite and `flutter analyze` pass. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Signed-off-by: Tom Brow <tomb@squareup.com> Co-authored-by: Tom Brow <tomb@squareup.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>