fix(web): reset send phase when latest turn settles

[aucre-coder]

Summary

This is a small, focused bug fix for a chat flow issue where the send button can remain in a loading state after the assistant has already finished responding.

The change is limited to apps/web/src/components/ChatView.tsx.

Problem

In some chat sessions, a thread can finish rendering the assistant response, but the composer can still behave as if a send is in progress. In that state:

• the send button keeps spinning
• the user cannot send another message in the same thread
• navigating away from the thread and back clears the issue

This was first observed on Windows, but it is not Windows-exclusive and can also occur in the web build.

That suggests the local ChatView send state can remain stuck even after the turn has already settled.

What changed

Added a small useEffect in ChatView that resets sendPhase back to "idle" whenever:

• sendPhase is still active
• latestTurnSettled becomes true

This keeps the local send state aligned with the actual turn lifecycle and avoids requiring a thread remount to recover.

Why this should exist

ChatView already clears sendPhase for some intermediate states such as:

• thread entering running
• pending approval
• pending user input
• thread error

But it did not explicitly clear the local send state once the turn had fully settled. If that earlier transition is missed, the local spinner can stay stuck until the component unmounts/remounts.

This change closes that gap with a minimal, targeted fix.

Before / After

Before:

After:

Manual test

1. Open a thread.
2. Send a message.
3. Wait for the assistant to fully finish.
4. Without leaving the thread, send another message immediately.

Expected result after this change:

• the send button stops spinning once the turn is settled
• the next message can be sent in the same thread without navigating away and back

Scope

• single-file change
• no backend or protocol changes
• no unrelated cleanup

---

Note

Low Risk
Low risk UI-state fix limited to ChatView send lifecycle; main risk is prematurely clearing the send spinner if turn IDs are mis-tracked.

Overview
Prevents the chat composer send button from getting stuck in a loading state by resetting sendPhase once a send results in a new, settled turn.

ChatView now records a baseline turnId when sending begins and adds an effect to call resetSendPhase() when isLatestTurnSettled is true and the latest settled turn’s turnId differs from the baseline. session-logic adds hasSettledLatestTurnAdvanced() to encapsulate that check.

^{Written by Cursor Bugbot for commit b71f7b5. This will update automatically on new commits. Configure here.}

Note

Reset send phase in ChatView when the latest turn settles and advances

• Adds a sendBaselineTurnIdRef in ChatView.tsx to record the active turn ID at the moment a send begins.
• A new useEffect calls resetSendPhase automatically when hasSettledLatestTurnAdvanced returns true — i.e., the latest turn is settled and its ID has moved past the baseline.
• Adds hasSettledLatestTurnAdvanced in session-logic.ts as a small utility that combines isLatestTurnSettled with a turn ID advancement check.

^{Macroscope summarized b71f7b5.}

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