Empty Enter while busy was a hard no-op, so a queued turn could only be
sent early via the panel's send arrow or Cmd+Shift+K. With prompts
queued, a second Enter now promotes the head and interrupts, mirroring
the idle empty-Enter drain. Nothing queued keeps the old no-op.
The panel's send-now row action switches from a bare up-arrow to the
return glyph, so the row states the keybind the double-send uses.
Brooklyn Nicholson
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