Fix sending messages during active turns

[jakeleventhal]

What changed

• track the latest projected user message in the local dispatch snapshot
• acknowledge sends that add a steering message to an already-running turn
• add regression coverage for steering without a new turn or timestamp change

Why

Messages sent while an agent was already working remain on the current turn. The composer only recognized server acknowledgment when turn metadata changed, so its local sending state could remain stuck until the thread was remounted by navigating away and back.

This change also treats the newly projected user message as acknowledgment, allowing subsequent steering messages without thread navigation.

Validation

• pnpm exec vp test apps/web/src/components/ChatView.logic.test.ts
• pnpm exec vp check
• pnpm exec vp run typecheck

Note

Fix message sending during active turns by recognizing steering messages as server acknowledgment

• hasServerAcknowledgedLocalDispatch now returns true during a running turn when the latest user message ID changes, treating a projected steering message as server acknowledgment
• LocalDispatchSnapshot gains a latestUserMessageId field, captured via findLast over messages with role === 'user' at snapshot creation time
• ChatView.useLocalDispatchState passes the current latestUserMessageId into the acknowledgment check, clearing activeLocalDispatch and unblocking isSendBusy sooner when a steering message appears

^{Macroscope summarized e78403b.}

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Note

Low Risk
Narrow composer UX fix in local dispatch acknowledgment logic with targeted unit tests; no auth, data, or API surface changes.

Overview
Fixes the composer staying in Sending after you message an agent that is already working. Steering adds a user message on the same running turn, so turn timestamps often do not change and the old acknowledgment logic never cleared local dispatch.

LocalDispatchSnapshot now records latestUserMessageId at send time. hasServerAcknowledgedLocalDispatch compares that id to the thread’s latest user message and, while phase === "running", treats a new projected message as server acknowledgment even when turn metadata is unchanged. useLocalDispatchState passes the current latest user message id into that check.

Regression test covers steering onto a running turn without a new turn or timestamp change.

^{Reviewed by Cursor Bugbot for commit e78403b. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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^{Reviewed by Cursor Bugbot for commit 9361c84. Configure here.}

[macroscopeapp]

Approvability

Verdict: Approved

Straightforward bug fix that adds tracking for the latest user message ID to properly acknowledge steering messages during active turns. The change is self-contained with clear intent, good documentation, and comprehensive test coverage.

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