Composer: show ▶ N indicator while background tasks run#74
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A /background task today produces one 'started' toast and then nothing until completion — no way to confirm it is alive or see how many are in flight. - src/app/background.tsx: BackgroundProvider holding a ReadonlySet of in-flight task ids, register/unregister with identity-preserving no-ops, useBackground() exposing count + ids. - slash.tsx registers the id when prompt.background resolves with a task_id; useStream unregisters on background.complete. Toast and transcript marker behavior unchanged. - Composer renders a '▶ N' fragment between the queue-flush hint and the model label when count > 0, hidden at zero. - Tests: provider semantics, composer fragment presence/absence, and the full register → complete lifecycle through MockGateway.
This was referenced May 21, 2026
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What
A
/backgroundtask today produces one "started" toast and then nothing until completion — no way to confirm it's alive or see how many are in flight.src/app/background.tsx—BackgroundProviderholding aReadonlySetof in-flight task ids,register/unregisterwith identity-preserving no-ops,useBackground()exposingcount+ids.slash.tsxregisters the id whenprompt.backgroundresolves with a truthytask_id;useStreamunregisters onbackground.complete. Toast and transcript-marker behavior unchanged.▶ Nfragment between the queue-flush hint and the model label when count > 0, hidden at zero.Tests
Provider semantics (register/unregister/dedup/reactivity), composer fragment presence/absence, and the full
/background→ register →background.complete→ unregister lifecycle throughMockGateway.tsc clean, 995/995 pass.