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- Server: DELETE /api/leaderboard/opt-in sets leaderboard_opt_in=0, hiding the player without deleting their row (scores preserved for re-opt-in) - SyncProvider trait: opt_out_leaderboard() default no-op method + blanket impl - SolitaireServerClient: implements opt_out_leaderboard via DELETE request with JWT refresh - Leaderboard UI: "Opt Out" button (dark red) alongside existing "Opt In" button - Server integration test: opt-out hides, opt-in restores (round-trip verified) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>