1. task-worker.ts: Pass full result object to completeTask instead of
non-existent result.data property (was causing {} to be stored)
2. WorkersDashboard.tsx: Handle null running_seconds in formatSecondsToTime
(was displaying "nulls" due to JS type coercion)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>