Brings the Downloads page up toward the music page's depth:
- Filter tabs (music-style pills): All / Active / Completed / Failed, each with a live
count; clicking filters the list. Cancelled rolls under Failed.
- Header actions: Cancel all (active) + Clear finished, shown only when relevant; a
live 'N active · N done · N failed' subline.
- Per-row actions: ✕ Cancel on active rows (→ /downloads/cancel), ↻ Retry on
failed/cancelled rows (→ /downloads/retry, re-grabs the release).
- Cancelled status styling (pill + dimmed row). Still the smooth in-place patching
(no blink), adaptive polling, empty + filtered-empty states.
Balance clean. Phase C (auto-retry + alternate-query retry) next.
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