SharedClientProviders implements the new language-aware LyricsProviders
boundary; both track-change and prefetch requests pass None (the default
original-only flow per spec section B.1) — the refetch-with-language is
triggered by the UI layer in a follow-up task. The committed LyricsDoc
now carries the translation into CURRENT_DOC automatically, so the sync
engine and the future UI toggle read the same document. qbz-core's
headless get_lyrics wrapper keeps its signature and fetches
original-only.
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