Phase 3: the stylized transparent title logo replaces the text title in the
billboard (the big Plex/Netflix 'premium' jump). Sourced from TMDB images
(append_to_response=images, include_image_language=en,null) in the same detail
call — no Fanart key needed.
- schema v4: movies.logo_url / shows.logo_url (idempotent migration).
- TMDB client picks an English logo (then language-neutral, then any); enrichment
backfills logo_url gap-only; show/movie payloads return 'logo'.
- Billboard shows the logo img (with graceful fallback to the text title on error
/ when absent; title kept visually-hidden for a11y). Lazy on-view refresh now
also triggers when the logo is missing, so existing libraries fill it in.
Seam tests: English-logo pick, backfill + payload, schema.
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