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🤖 ## Summary Mobile threads could open above the newest reply because the reply query hydrates across relay pages while the list is still being laid out. Ordinary thread opens now wait for authoritative hydration and late layout before settling on the latest reply. The initial settle is generation-guarded: if another reply arrives while it is pending, the stale target is discarded and the current tail becomes the target. Explicit deep links still own their requested position, existing threads only follow remote replies when the previous tail was visible, and local sends remain visible. ### Related issue No matching issue found. This is separate from the channel unread-navigation behavior in #4239. Originating Buzz thread: `buzz://message?channel=a9081ecd-9be0-400b-8bf9-2e8e0d385b80&id=bfb289fc53754f62f641fbf58bf2d7a9c181a3e6eb09a6ba762aeb6904b6cde4&thread=bfb289fc53754f62f641fbf58bf2d7a9c181a3e6eb09a6ba762aeb6904b6cde4` ### Testing - Added a widget regression covering paginated hydration plus a live reply arriving during the initial settle. - Full mobile Flutter test suite passed; `flutter analyze` passed. - GitHub CI passed, including the Mobile job. - Built, installed, and launched the debug app on an iPad Pro 11-inch (M4), iOS 18.6 simulator. An authenticated manual thread traversal was not performed because the fresh app was not paired to a relay account. --------- Signed-off-by: npub13n66s06epmqf2kc3v373ez8hj65cuzyvxzjf93vwpervxqn2u7jq2qd9je <8cf5a83f590ec0955b11647d1c88f796a98e088c30a492c58e0e46c3026ae7a4@buzz.block.builderlab.xyz> Signed-off-by: loganj <loganj@squareup.com> Signed-off-by: npub1em3jmyn4vu57urqf03txrwreccvejvwdy5c4er8nnrwt7rc4tncscs3ssu <cee32d92756729ee0c097c5661b879c6199931cd25315c8cf398dcbf0f155cf1@buzz.block.builderlab.xyz> Signed-off-by: Brother Darryl <146fb160a3266e6165bfa385f6048c975eda9e21cf65da097a0b5ea7952532a5@buzz.block.builderlab.xyz> Signed-off-by: Larry <8cf5a83f590ec0955b11647d1c88f796a98e088c30a492c58e0e46c3026ae7a4@buzz.block.builderlab.xyz> Co-authored-by: npub1em3jmyn4vu57urqf03txrwreccvejvwdy5c4er8nnrwt7rc4tncscs3ssu <cee32d92756729ee0c097c5661b879c6199931cd25315c8cf398dcbf0f155cf1@buzz.block.builderlab.xyz> Co-authored-by: npub13n66s06epmqf2kc3v373ez8hj65cuzyvxzjf93vwpervxqn2u7jq2qd9je <8cf5a83f590ec0955b11647d1c88f796a98e088c30a492c58e0e46c3026ae7a4@buzz.block.builderlab.xyz> Co-authored-by: Codex <noreply@openai.com> Co-authored-by: Brother Darryl <146fb160a3266e6165bfa385f6048c975eda9e21cf65da097a0b5ea7952532a5@buzz.block.builderlab.xyz>