The dashboard 'Manage Workers' button now opens a video enrichment modal that
reuses music's global .em-* modal CSS (identical look) but is entirely its own,
isolated JS: own #vem-overlay, event-delegated (no inline handlers, no music
function calls), targets /api/video/enrichment, shows only TMDB/TVDB with
movie/show coverage.
- Rail of workers (status dot + coverage), panel with pause/resume, per-kind
coverage cards (matched/not-found/pending segmented bars), and a paged
unmatched browser with retry (item + retry-failed).
- Polls the selected worker every 3s. The few invented sub-classes are styled
scoped to #vem-overlay so music is never affected. 87 tests green.
