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**Category:** fix **User Impact:** Canceling a deferred attachment during send preflight no longer leaves a phantom timeline row. Expose prepared-upload cancellation state so send staging cannot begin after the task was canceled, and defensively remove any adopted row when upload start loses the cancellation race. Extend focused coverage for pre-start cancellation and navigation-bound row identity. Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz> Signed-off-by: Wes <wesbillman@users.noreply.github.com>