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Stop button: while the chat's agent has an active turn, the composer's send button becomes a stop button that sends the cancel-turn control frame to the agent; a user message in flight keeps the sending spinner. (MessageComposerProps moves to a sibling file to stay under the 1000-line ceiling.) Branch chip: tool activity only exists from observer-subscription time, so a worktree created before the app attached left "No current branch" even though the agent had announced it. The agent's persisted messages are now a fallback source — "…on branch kennylopez-dictation", backticked branch names, and quoted git commands all parse. Markers: the completed-work expander label and tool preview text drop to muted-foreground so every marker row reads as secondary to the conversation. Shimmer: per-theme band colors — light keeps primary washed toward white; dark mixes primary toward black in oklch, which keeps the hue saturated instead of graying into the background, for a clearly stronger sweep against near-white text. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>