Keep the platform lookup Future in widget state and replace it only when track identifiers change. Theme rebuilds retain loaded content without another native call.
Add widget regressions for theme and identifier changes.
Track options gain an Open on... entry listing every streaming platform
song.link resolves for the track, served by a new generic
GetTrackPlatformLinks with its own memory cache beside the availability
cache (same request budget). The sheet is data-driven from the platform
map so the app core stays service-agnostic. Completes the bridge
wrappers already landed in 901fa34d; also carries the en strings for
the duplicate review sheet landing next.