pollVoiceQueue began with 'if (!s || !s.items) return;'. On an unexpected
payload that returned before the code that clears the interval, so a page
left open polled /api/voices/queue every 2s forever. The web log shows 626
such polls - about 21 minutes of continuous requests from a browser through
the Caddy proxy, with CLOSE_WAIT sockets accumulating alongside.
An unexpected response now stops the poll rather than skipping the check.
Verified in a real browser against a deliberately malformed payload: one
request, then stopped, where it previously never stopped.
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