Replace the four stat cards with a compact three-card strip: 7-day activity
with inline SVG sparkline (new ActivitySparkline), Running Now / Next Check
with per-source countdown list, and System with credential health + disk
usage bar.
- Add GET /downloads/activity-timeline — per-day completed/failed/files
counts, pre-filled with zero buckets so the sparkline always has N points.
- Report filesystem-level usage via shutil.disk_usage in storage rollup,
plus a live fallback in GET /settings so the capacity bar works before
the first Celery rollup runs and for cached rows that predate the field.
- Extract Download Details into a reusable DownloadDetailsModal component
and wire Recent Activity rows to open it (previously Downloads-page only).
- Compute next scheduled check per source from global schedule_interval;
surface credential expiration/missing alerts scoped to platforms that
actually have enabled sources.
- Two-speed polling (5s when downloads are active, 30s idle) with Page
Visibility awareness so background tabs don't churn the API.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
bvandeusen
851df294f2