Replace the synchronous useAcpPrompt mutation with a streaming WS
hook. The agent's reply now arrives chunk-by-chunk and the same
agent bubble grows in real time.
- web/src/lib/api/acp.ts:
- Add AcpStreamEvent / AcpStreamStatus types.
- Add useAcpStream(workspaceId) hook: per-prompt WS lifecycle
(idle -> connecting -> open -> closed / error), open(content)
/ close() / onEvent(cb) API. Reuses the reconnection / 1000-1001
/ pinger pattern from useProcessWebSocket.
- Keep useAcpPrompt and useAcpCancel exported for back-compat.
- web/src/components/acp/AcpPanel.tsx:
- Switch to useAcpStream. handleSend pushes an optimistic user
message, opens the stream, sets an inflight agent bubble with
empty text.
- chunk events append to inflight.text; complete clears inflight;
error clears inflight and shows a local error toast.
- renderMessages = coalesced + localUserMessage + inflight.
- Local user message is auto-cleared when the next history poll
surfaces the same text (avoids duplicate render).
- Auto-scroll effect depends on inflight.text so it fires as
chunks stream.
- Cancel button closes the WS (server's read loop triggers
session/cancel).
- Remove the standalone ThinkingIndicator; the in-flight bubble
serves as the streaming affordance.
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