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Taylor HoandCarl 1b3b236555 feat(composer): relabel working pill to "is typing" in place while agent types

An observer-backed agent that started typing its reply mid-turn had the
typing signal swallowed entirely: computeAgentWorkingState drops a
channel's typing entry under observer precedence, so the pill kept
showing the stale last tool action and typing could only ever surface as
a separate item in the trailing typing group. Now the existing pill's
ticker swaps to "<name> is typing…" in the same slot and swaps back to
the last action headline when typing clears.

- desktop/src/features/agents/agentWorkingSignal.ts: add
  getAgentChannelTypingSince(pubkey, channelId) — a raw typing-registry
  read that deliberately bypasses the observer-precedence fold,
  returning the first-seen typing timestamp or null
- desktop/src/features/channels/ui/BotActivityBar.tsx:
  BotActivityAgentPill subscribes via useSyncExternalStore; while
  typing, the ticker keys on a dedicated TYPING_LABEL_ID and the label
  becomes "<name> is typing…" — same slot, avatar, and hover feed, no
  new strip item. Partition unchanged: typing-only agents still divert
  to the combined typing indicator group
- desktop/src/features/agents/agentWorkingSignal.test.mjs: three new
  tests pinning the getter (null cases, first-seen anchor lifecycle,
  and not-folded-under-observer-precedence)

Co-authored-by: Taylor Ho <taylorkmho@gmail.com>
Signed-off-by: Taylor Ho <taylorkmho@gmail.com>

2026-08-05 16:42:01 -07:00