Mirrors the bouncing-dots indicator ChatTab already shows while waiting
for an agent reply. Before this, an operator delegating to one or more
external peers via Agent Comms saw their outbound bubble land and then
silence until the reply (or queued/failed status) arrived — no visual
"the system is working on this" cue.
Per-peer not global: when multiple delegations are in flight to
different peers (the fan-out case), one shared spinner under-reports —
the user can't tell whether ALL peers are still working or just the
visible ones. Per-peer matches Slack typing-indicator semantics and
keeps the signal honest.
Detection rule: walk visible messages, keep only the chronologically-
last bubble per peer. If that tail is `flow === "out"` AND status is
"pending" or "queued", emit a waiting bubble. Once an inbound reply
lands, the tail flips to "in" and the bubble disappears — even if the
backend hasn't mutated the original outbound row to "completed" yet.
This collapses both states into one rule.
Visual: matches the outgoing bubble (cyan-900/30 + cyan-700/20 border,
right-justified) with cyan-300/70 dots that respect prefers-reduced-
motion via `motion-safe:animate-bounce`. Queued case adds copy
explaining the peer is busy. role="status" + aria-label so SR users
also hear "Waiting for reply from <peer>".
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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