LyricsRequest carries an optional translation target that threads
through the LyricsProviders::qobuz boundary to the client; the external
fallback chain is untouched. LyricsDoc gains translation
(Option<Box<TranslatedLyrics>> with a LyricsKind dispatch mirroring the
Android v10 mapper: wsync->WordSynced, lsync->LineSynced, plain->Plain)
plus a client-derived has_translation (requested lang in
translation_langs, false when none requested). QobuzWsync stores the
translation verbatim in the existing cache JSON (serde default, no DB
migration) with its lang recorded: a synced cache hit only serves a
language request when the stored translation matches it, otherwise the
chain refetches; original-only requests keep today's behavior.
km
vicrodh
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