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When the /devices fetch hasn't completed or fails, parseInt on an empty select returns NaN which JSON-serializes to null. The backend then calls int(None) and raises TypeError. Fix both layers: frontend falls back to 0 on NaN, backend uses `or` defaults so null values don't bypass the fallback. Also adds a short TTL cache to detect_all_devices() so multiple concurrent callers on the same page load don't each spawn blocking subprocess probes. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>