[princecherry9905]

Closes #156. Part of #153.

Why

While a reply ran, a 1s interval in chatStore wrote elapsedSeconds into the session, so the page, the message list, the composer and the streaming indicator all re-rendered once a second for the whole turn.

What changed

• Both intervals are gone: the one started in sendMessage and the one applyMirror started when a turn began running. The elapsedSeconds and elapsedTimer session fields go with them, along with every clearInterval that only existed to stop those timers (stop, message complete, error, history reload, /clear, disconnect).
• As you suggested, the start time comes from the server's turn.startedAt in the mirrored session state, not from a value recorded on the client.
• ElapsedTime (new, components/chat/ElapsedTime.tsx) keeps its own 1s timer and computes the value from startedAt, so only that span re-renders each second. StreamingIndicator renders it while the mirrored turn isn't idle. The format (42s, 1m 5s) and the "hidden at 0s" rule are unchanged.
• Test fixtures drop the two removed fields. teamStore's member session default drops them too.

Behaviour difference: the time now starts when the server marks the turn as running, not at the moment you press send. Before that the indicator shows the verb with no time, which is what the old code showed during the first second anyway.

Tests

• chatStore.test.ts: "leaves the store unchanged while a turn runs" sends a message, starts a running turn and advances fake timers 5s, then checks the sessions object is the same reference.
• StreamingIndicator.test.tsx (new): counts from the server's start and ticks each second (1m 5s then 1m 6s), shows the right time after switching sessions, keeps counting from the same start after a reconnect snapshot, and shows no time when no turn has started.
• 4 of the 5 new tests fail on main (the 5th checks the idle case, which already passed) and all pass with this change.

Checks run locally (bun 1.4.2):

• cd desktop && bun run lint: pass
• cd desktop && bun run test -- --run: 115 files, 1195 passed, 4 skipped
• cd desktop && bun run build: pass
• bun test (server): 1343 pass, 2 fail. The failures are h5-access-service.test.ts (getDiagnostics) and e2e/business-flow.test.ts (echo message), and both fail the same way on unchanged main in my environment. This PR doesn't touch server code.

I couldn't run bun run tauri dev in my environment, so I haven't watched it in the app.

[GoDiao]

Thanks, this looks good to merge.

[GoDiao]

Merged, thanks @princecherry9905! This was a clean first PR. Reading the start time from the server's turn.startedAt was the right call, the timer cleanup covers every path the old interval touched, and the store test that checks the sessions reference stays the same is a nice way to pin the fix. The PR description made it easy to review too.

We added the CHANGELOG entry. If DreamCoder is useful to you, a ⭐ on the repo would mean a lot. Hope to see you around for more!