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Swipe-to-reply used a rightward drag, the same direction as iOS swipe-back. A rightward drag that started on a message armed a reply instead of going back, and the reply recognizer claimed horizontal drags in either direction once they started on a bubble. Now a message slides **left** to reveal Reply on its trailing side, and the reply recognizer only wins the gesture arena for leftward drags. Rightward drags that start on a message are left to back navigation. The threshold, haptic, rubber-band resistance and thread destination are unchanged. On bubbles that reach the row's trailing edge (your own messages), the Reply feedback is kept on screen beneath the bubble, so the slide uncovers it. ### Demo Before (main): a rightward drag that starts on a message arms Reply and slides the bubble, instead of being left to back navigation. https://github.com/user-attachments/assets/f149cd11-c326-466c-a17b-3e4698708af8 After (this PR): a rightward drag on a bubble does nothing, a leftward swipe reveals Reply and opens the thread, and edge swipe-back returns to the channel. https://github.com/user-attachments/assets/539a5682-1032-452e-a57b-6f27abfe2d64 ### Validation - Focused existing validation: the swipe-reply widget tests were mirrored to the new direction for channel and thread rows, own and incoming messages. They now also check that a rightward drag starting on a bubble reaches an outer horizontal drag handler (a stand-in for swipe-back) without moving the row or opening a reply. The Bestie DM test's reply drag was flipped too. - The full mobile suite (`just mobile-check` and `just mobile-test`) passes. - Automated simulator run (iPhone 17 Pro, debug build): swiped left on outgoing and incoming bubbles (feedback shows on the trailing side, thread opens), edge swipe-back from a thread and channel, and a rightward drag starting on a bubble (no reply). The demo above was recorded on a synthetic private channel (own messages only; incoming-message rows were covered in the earlier run and by the widget tests). Human testing is waived under the owner's standing exception. 🤖 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>