Mobile companion: "Percolating..." status indicator keeps blinking after the assistant turn has already finished

Description
On the mobile companion view, after Claude finishes a turn and the full response is already rendered, the orange "Percolating..." status indicator keeps blinking/animating, as if a turn or background task were still in progress.

Steps to reproduce

1. Open a Claude Code session from the mobile companion app/view.
2. Send a message and wait for the full response to render.
3. Observe the "Percolating..." indicator near the top of the response area.

Expected
Once the assistant turn is fully done and no background task/agent is actually running, the "Percolating..." indicator should stop/disappear.

Actual
The indicator keeps blinking even though the response is complete and no background work is active (confirmed via the session's own agent list showing nothing running).

Impact
Minor but confusing — a user reasonably reads a persistent "still working" indicator as meaning the assistant has not actually finished, when it has