Folding on the next message reserved the whole closing height as bottom
room and kept scrollTop whenever the input had no transcript echo on this
page: a message from another tab, a queued message delivered after the
previous Turn, or a send from a subagent child in the right Sidebar. A
reader below the fold was left on an empty viewport.
Every batch of closing rows now runs on the viewport's frame-clock driver.
It lands at the tail for this client's own input or a following reader and
otherwise keeps the reader's content still, installing only the room the
landing lacks. Subagent child sends register a local echo and pass its
request id to subagents.prompt, so the child's recorded message retires it.
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