Dashboard: show a relative next-run countdown

[peopleworks]

What

On the dashboard, show a human-friendly relative next-run countdown (e.g. in 3m 20s) next to each job, in addition to the absolute next-run timestamp.

Why

A relative countdown makes it obvious at a glance which job fires next — friendlier than reading timestamps.

Suggested approach

• The next-run time is already computed (Cronos). Render a relative string in the dashboard table.
• A small client-side timer can keep it ticking without a full refresh.

Acceptance criteria

• Each job row shows a relative next-run alongside the absolute time
• Updates without a manual page refresh
• Degrades gracefully for paused/invalid jobs

Friendly front-end task — comment to grab it.