Browser pane webview unloads (blank URL bar) after idle, independent of backing server

After going AFK for an extended period (observed at ~30min, over lunch, and overnight), the Browser pane returns with an empty URL field — not an error page at the previous URL, the address bar itself is blank/unloaded.

Confirmed this isn't a backend issue: the local dev server behind the pane was still running and listening the whole time in every case. Once caught a coincidental restart of the shared server process from another concurrent session, but ruled that out as the cause — the overnight/lunch occurrences had no server restart at all, same symptom.

Looks like idle-driven teardown of the pane's own webview state, not a connection failure. No user-facing setting found to disable/extend this.

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