Backend:
- Track running cron jobs in thread-safe dict (job_id → start_time)
- Wrapper _run_cron_tracked() marks done on completion
- New GET /api/crons/status?job_id=... returns {running, elapsed}
- New GET /api/crons/status returns all running jobs
Frontend:
- After 'Run Now', enters watch mode with 3s polling
- Shows running indicator (spinner + elapsed timer) in detail card
- Auto-detects running jobs when opening detail view
- Stops watch and refreshes output on job completion
- Cleanup on detail view switch
Note: True SSE streaming is not possible because the hermes-agent
scheduler writes output files only on completion. This polling
approach provides real-time status feedback within that constraint.
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