New iTunes Link tab between Deezer Link and YouTube. Accepts album,
track, and playlist URLs from music.apple.com / iTunes. Pulls the
tracklist, runs it through the same discovery -> sync -> download
pipeline as the other link tabs.
Apple Music playlists go through amp-api with a Bearer JWT scraped
from the SPA. The legacy meta-tag and inline `"token":"..."` paths
are gone in the current music.apple.com SPA, so the extractor now
walks the page's `<script src>` list (prioritising index/chunk/main
bundles), fetches up to 8 JS bundles, regex-matches JWT-shaped
strings, and base64-decodes each payload to confirm it carries
Apple media-api claims (`root_https_origin`, or `iss + iat + exp`)
before trusting it. Filters out analytics / error-reporter JWTs that
also ship in the bundle.
Tokens are cached at module scope for 6h behind a threading.Lock so
the three-worker discovery executor doesn't thunder-herd Apple on
cold start, and amp-api calls go through a single helper that on
401 invalidates the cache, refetches the page, force-refreshes the
token, and retries the request once. The playlist fetcher memoises
the page HTML for the cache-miss path so we don't refetch it for
every paginated `/tracks` page.
spotify_public discovery worker accepts the new platform shape so
iTunes Link reuses the same matching code path as Deezer Link and
Spotify-public. UI bits live in the sync-services.js iTunes Link
tab, with platform plumbing through wishlist-tools.js for the
multi-source state map.
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