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The transcript dialog opened from a running task's row showed only a one-shot snapshot taken at open time: TranscriptButton fetched once via api.listTaskMessages and cached it locally, never subscribing to the shared ["task-messages", taskId] cache that the WS task:message stream already seeds. New tool calls / thinking / text never appeared until the task finished or the page reloaded. Add a live-cache mode to the shared TranscriptButton: when isLive and the parent provides no items and the task id is a persisted UUID, render from the shared task-messages cache so the open dialog grows in real time. On open (and again on the running→terminal transition) force a backfill via api.listTaskMessages and merge it into the cache by seq — taskMessagesOptions is staleTime:Infinity, so a plain subscription never heals a WS reconnect gap. The cache observer is read-only (enabled:false) so React Query never blind-replaces the cache; only the WS handler and the seq-merged backfill write it. The subscription mounts only while the dialog is open, so closed live rows add no baseline requests; terminal tasks keep the lazy one-shot fetch. Covers issue execution-log and agent activity. Autopilot issue-less run_only live log is out of scope: the backend doesn't broadcast task:message for tasks with no issue/chat session, so there's nothing to subscribe to — backend broadcast unchanged. Extract mergeTaskMessagesBySeq into packages/core/chat/queries.ts and route both the realtime task:message handler and the new backfill through it, so there is one seq-merge semantics for that cache instead of two. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com> Co-authored-by: multica-agent <github@multica.ai>