Running session loses visible thinking state when switching between two active sessions

[doctCui]

Description

When two sessions are executing at the same time, switching between them causes the in-progress thinking/execution state to become invisible for the session that is no longer selected.

The backend session appears to continue running, but the UI does not keep or restore the live thinking/status view when switching back.

Steps to reproduce

1. Start OpenWorker with a local Ollama model.
2. Open two sessions.
3. Start a task in session A and, while it is still running, start a task in session B.
4. Switch between session A and session B while both tasks are still executing.
5. Switch back to the other session.

Actual behavior

The session may still be executing, but its thinking/progress state is no longer visible in the UI after switching sessions. The live state is not reliably restored when returning to the session.

Expected behavior

Each session should retain and display its current running state, streamed thinking/reasoning, progress events, and Stop control independently. Switching sessions should not hide or lose the live execution state; returning to a session should show its current state immediately.

Environment

• macOS 15.6.1
• OpenWorker local development build
• Ollama local provider
• Model: ollama:qwen3:4b
• Reproduced with two concurrently running sessions

[akkikumar72]

Raised a PR for this fix

[ulanch]

Same symptom here, with two differences that may matter for the fix in #349.

I only have one session running, not two. Navigating to Settings and back is
enough to lose the trace, so this is not specific to switching between two
active sessions. Any unmount of the conversation view seems to drop it.

It also reproduces against remote providers, not just local Ollama: Kimi K2
and Kimi K3 via Moonshot, on the packaged app rather than a dev build. The
sidebar activity dot keeps pulsing for the session while the transcript pane
is empty, so the run is clearly still live server-side. There is no way from
the UI to tell a running session apart from a dropped connection.

Question for @akkikumar72 on #349: does the fix replay the buffered reasoning
deltas on remount, or only restore the Stop control and thinking indicator?
If it is the latter, the trace itself would still be lost, which is the part
that leaves you blind to whether the run is alive.

Environment:

• OpenWorker 0.1.7
• macOS 27, Apple Silicon
• Kimi K2 and Kimi K3 via Moonshot
• Packaged app (not a dev build)

[akkikumar72]

Hey @ulanch

That distinction is valid. #349 currently restores the server-side running state and Stop/live indicator, but it does not replay reasoning deltas emitted while the conversation view was unmounted. I’ll account for the Settings remount case and the missing live trace separately.