Prompts submitted while a turn runs queue above the composer (edit,
remove, auto-send on completion; interruption or a failure pauses the
queue with an explicit resume). Permission requests and elicitations
route from the ACP client in main to renderer cards with the request
options — pending cards replay when the renderer reloads, replacing
the blocking OS dialogs. The task plan docks above the composer instead
of scrolling inside the thread, multi-line user bubbles trim their
padding lines, and a turn that ends abnormally shows an inline error
line in the transcript.
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