Each job shows a tooltip (what it does + what happens if it stops), a status
dot legend + per-dot tooltips clarify the colours, and the interval is inline-
editable (pencil -> number -> save) wired to the new PATCH endpoint. HU/EN/DE.
New admin Scheduler page (left-nav entry) with a live, self-refreshing view of
job activity, queued work and quota. Polling is factored into a reusable
useLiveQuery hook (pauses when the tab is unfocused) that the notification bell
and future yt-dlp job queue will reuse instead of re-implementing.
