Web UI (mobile): session status goes stale after tab suspension — spinner stays 'thinking' until full page reload

Description

On mobile browsers, when a session is running and the tab gets suspended (screen lock or app switch), the UI keeps showing the session as "thinking" even after the run already finished. A full page reload is the only way to see the real state.

The session status in the web UI is driven by server events. When Android suspends the tab the event stream dies silently (no error is raised), and when the tab becomes visible again the client doesn't re-fetch the session status, so the stale spinner stays on screen indefinitely.

The client already listens to visibilitychange for other things, but never reconciles session status on visibility regain or stream reconnect.

OpenCode version

1.18.23 (opencode web --hostname 0.0.0.0 --port 4096)

Steps to reproduce

1. Open a session from a phone (Chrome on Android) and start a task that takes a while
2. Lock the screen or switch to another app while the agent is working
3. Let the task finish (verify from another client, e.g. the desktop)
4. Go back to the tab on the phone: the session still shows the "thinking" spinner
5. Reload the page: the status updates correctly

Expected: on visibilitychange (or on event-stream reconnect) the client should re-fetch /session/status and reconcile any missed events.

Workaround: full page reload.

Operating System

Server: Windows 11 Pro (10.0.26200). Client: Android 16, Chrome (also seen on other Android browsers)

Plugins

None

Terminal

n/a (web UI)